Regardless, it is a bad decision by the homeless person and an example which a better informed author would have left out. Insomnia is less harmful than hypothermia.
It isn't that alcohol doesn't really warm you, it is worse than that. It actually makes your body core colder while giving the illusion of the opposite.
insomnia itself and especially caused by trauma can be much more harmful, the author did choose a weird and stereotypical example but if you can't even get a night's relief from your stressful impossible to escape situation. after years of a situation why wouldn't you just assume the long term is bleak and prioritize short term counter productive relief.
assuming dying is something you'd be avoiding at all costs at that point really shows a lack of empathy
As someone who's literally been in the figurative position you're using to attack someone:
Neither I nor anyone else who's experienced homelessness is a pawn for your Internet argument bullshit. How dare you? Go pay the next panhandler you see $50 as penance.
You are completely wrong. It is absolutely horrible and disgusting that you're out here arguing that someone might want to freeze to death. These are the words of someone who's never been more than a little chilly, not someone who's had to struggle against the cold to survive.
Seriously, go give a homeless person $50 and get our shared struggle out of your mouth.
There is more to it than temperature that is overlooked by brevity.
When you're in a stressful, and uncomfortable, situation like that the numbness helps with the cold, possibly uneven, ground.
It can quiet the mind. And the inhibition can help nullify the fight or flight response aiding in getting to sleep.
There are several properties of alcohol that makes it seem like a reasonable deduction to drink a bit in order to sleep. Even if it is harmful and could compound the suffering down the line.