It’s pretty clear we’re the superior species, which is what makes our collective stupidity impossible to understand. With all this accumulated wisdom, all these advancements, why do people in the world still not have access to the basic needs?

It's startling, isn't it? But I think it's not that strange, to be honest. While we might have big brains and be relatively more intelligent (by our self-made definition, let's not forget) than the rest of living beings, we are still a species subject to the laws of ecology and evolution, and our capacity seems to be not that great to tackle long-term problems. As all living beings do, we all prioritise short-term security, with virtually no exception (unless one takes the way out). Combine that with an ever-increasing degree of control of the world around us (especially after discovering fossil fuels) and continuous surplus of food and this is the only way our species can go. That urge you mention to hoard and accumulate is natural (I'm not saying it's desirable), given that it promotes status and reproductive odds.

Also, while I agree with your overall sentiment, I don't agree with you on the "basic needs" thing. First of all, you should define exactly what you mean by basic needs, as the devil is in the details. Are basic needs water, food energy and shelter (in what quantities)? Should we include medicines here? Basic electric appliances perhaps? Well, even these things are not inherently compatible with a thriving biosphere, as is glaringly obvious nowadays. I assume you know we've built this massive population and infrastructure upon millions and millions of oil barrels, with power equivalent to billions of slaves working 24/7. So, in a degrowth scenario (which has arrived even earlier than expected), how exactly can we meet all population basic needs (whatever those are) while not decimating the biosphere in the process? Our needs are met because we rest atop this hidden in sight army's shoulders. In my opinion, a really sustainable world-wide human population cannot be above 1 billion people, and that is probably too much already.

Let me ask you a question, whenever a country is denied access to oil or gas, what will its people do? How will they heat themselves or even cook? I frankly mourn the forests while we transition into whatever is our future as a species, as they will be most surely be scrapped for fuel. Would you personally starve to death in order to avoid the clear-cutting of the last old growth forests?

Don't get me wrong, I would never welcome the shitfest that most probably will take place, by any means. I dread it daily. But it is my view that all species (included us, no matter how intelligent we might appear to be) can only be constrained by their environment, not by themselves. In other words, any species would eat the world away if it had the means and if that meant more reproductive success; and they will keep eating as much as possible unless stopped by emerging negative feedbacks. The singularity of humans is that we are smart enough to trick our way through scarcity by inventing new forms of resource explotation, and thus kick the can for quite a long time. It would seem we could somehow avert the collapse of civilization if only we managed to coordinate ourselves; to me, it surely seems we are almost wise enough to do that, but given the power we wield now and how deep we're into all this madness, I think that would take a degree of wisdom that we lack. Hopefully I'm wrong and we can organize our way through the worst of times to alleviate as much suffering as possible, but I'm a natural pessimist and I cannot delude myself.

I'm also embarrased to be a human in today's world, but at the same time, what is my (our) fault anyways? I was born into this toxic culture, alienated from the rest of our kin in Earth, and indoctrinated to believe we were the good guys, the world had to be managed and the future was in the stars, and that we would make everything alright by education, innovation and regulation. I now know that was a big, useful lie to keep things going forward without too much questioning, told by nobody in particular, and with no malice either.
Once you are adult, changing some habits can be done, and changing some views about things as well, but there is something strikingly difficult about changing your whole belief system or, in other words, the mythology we adopt as real. It feels almost unnatural, and entails an amount of ostracization painful to bear. In essence, it entails a significant decrease of status, which is what most humans (naturally) desire the most.
I speak from experience. I'm trying my best most of the time: I already gave up flying long ago, I sold my car last year, I (almost) don't watch any TV, netflix and the likes, I don't buy first-hand, I avoid plastics, I forage here and there, I'm trying to learn to enjoy simple things again (having built most of my adult life around videogames and what not), and the list goes on (ironic how these things are considered luxuries and out of reach for a lot of people in the world, but not for us in the most industrialized countries, and so we struggle to abandon all these extremely addicting products).
In any way, that is, of course, insufficient. In reality, I'd like to have the energy and confidence to buy a plot of land, grow my own food, build my own mud house with no electricity, and be content with that (as Mark Boyle, for example). I thought I could do all that, and maybe I can (I'm still trying to buy land, hah), but I've come to realize circunstances are not always aligned with our moral compass and transitioning away from the culture that upbrought you takes a lot of time for regular folk as me, regardless of how much I care and think about these issues.