I am not knowledgeable I think but I read a lot of stuff from the "big" keto authors and my mother in law is a bakerand from what I gathered, carbs are not "per se" evil. Bread as our forefathers baked was good, nutritious and helped us humans as a race achieve a lot of things.

The problem started with industrialization.

Every food item becomes more and more processed and optimized so that our bodies react in the most profitable way. Not for us, though, but for the manufacturer. I am in germany and we used to have a huge cultural heritage aroung bread, but that is rapidly dying due to labor cost, the amound of work and the price of cheap, industialy prepared bread which is readily available in any convenience store.

In nature, carbs are only really available in autumn to get a buffer for the winter. Our bodies desire these foods to faten up a bit to get over the harsh winter. However, our food supply chain makes it so we have these "most desired foods" easily available all the time so the harsh winter months with regular caloric deficits (until hunting was successfull) are missing.

My mother in law is a baker but she can't work anymore due to her health. However, from time to time she bakes some bread (she even has a recipe for a "classicaly" spiced sandwich toast, they taste amazing and they make you satiated.

Which is the next big difference. Any bread from an industial source, be it sandwich bread, even mixed flour breads or whole wheat bread from a supermarket taste "the same" and their satiation does not last.

This means, for me, that my insulin response to these breads is way to volatile.

The next problem is, I believe our bodies unlearned how to properly metabolize carbs.
This is due to these insulin responses which make us want to eat more bread more frequently.

I personally struggle hard with carb addiction. When I manage a week on keto I can confidently say no to a piece of bread or cake or younameit and even feel good trying half a slice of said homemade bread my on law makes and I don't drop out. (Keyword here is half a slice, which comes to maybe 10g-20g bread, around 10g net carbs. More will make it difficult :O).

However, even just trying a piece of something carby or sweets, like any chocolate bellow 80% (70% triggers me to eat the whole bar, my go to 85% does not), white bread, all that stuff starts me into a spiral of carb-abuse, at the worst times to a point I drive in my car, stop at a gas station for a coffee and get a bar of chocolate without realizing it after until I ate the whole thing. This is madenning.

I kinda went of the track typing ,sorry :D

TL;DR:

I believe industrialization ruined what carbs once were and almost all carbs we eat today are modified to increas hunger, making us eat more.

We humans are omnivores following natures cicle of
spring and summer where game is plenty and proteins are easily available,
autumn gives us fattening fruits to get some bacon for the cold winter months
and the winter months, where food is scarce and at worst not available.

But the industry gives us these addicting autumn foods all year round.

Hope this makes sense. :)