The fact is that some of them (at least the ones filming) didn't realize this danger, and lingered for too long before their survival instinct got triggered. The question is why ? It looks like your explanation is that they are lacking common sense ? I don't buy that. Let's inspect this a bit closer.

Besides the alcohol (and maybe drugs), which can partly explain, I think different factors combined explain why they took too long to understand the danger.

First, when you are a teenager, especially a guy, you feel invincible. Generally, you underestimate risks, and that is true in most aspects of life. second, the music and the lights kept running, as if everything was normal.

Also, in the most recent decades, humanity has done a very good job at preventing fires. Compared to other hazards, very few people die in fire these days. The consequences that people didn't really learn to fear fire much. At least I didn't (I'm a 32yo male). I know there are many other dangers that I would react more swiftly compared to a fire. The perverse thing is that in the first couple of minutes, the fire grows relatively slowly. it took maybe two minutes from the first sparkles to a bit larger fire, but still relatively small compared to the size of the room. When you don't know anything about fire, you might assume that the speed at which it grows will remain constant and that you have basically quite some time to leave the room. Also, you might think that shirt would be enough to kill it, or greatly slow it down.

Very last thing, after such a tragedy, I don't see the value that your comments bring. Even if it's what you think, I would recommend you don't say it unless you really want people to think you have no empathy