Because it's pleasant. I don't know why people drive if they don't absolutely have to when it's so dangerous, I don't know why people live in cities when the pollution causes so many health problems, I don't know why people keep hanging out with other people when so many turn out to be reprehensible, etc. The answer is, because life is not about living the longest in the most austere manner possible.
People drive because they need to get home for shelter, or get to work, etc. People live in cities because that's where the higher paying jobs are, again for survival, also given that one can use air purifiers at home and wear a mask outdoors. It is irresponsible to accept risk without reward.
In many developing countries, alcohol risks being contaminated with methanol which is extremely deadly. I wouldn't consider taking such an unnecessary risk to feel pleasant. Knowing everything I know, I would feel more scared than pleasant.
It's not odd; it's the burden of being aware and not ignorant. Of course I take pleasure in several things that won't give me cancer. I also realize that true pleasure comes only after labor and pain. In contrast, alcohol is the kind of pleasure that is followed by pain.
I have a relative who drank regularly. He now has a bad case of gout because of his drinking.
Two others got diabetes from all the unhealthy food they ate while drinking, and died from it.
A coworker who drank regularly got brain cancer and died from it.
An ex-friend long ago basically killed someone drinking and driving.
Most humans don't learn from the dead but they should.
