People drink for several reason as you mentioned. But if they took it too far and become alcoholic then that is biggest part we have to worry about. Drinking isn't a bad thing to do, same as we eat toffee knowing that we might get diabetes and eating fried chicken very often knowing we might die from heart attack. But toffee and fried chicken isn't going to hurt anybody other than our-self where alcohol addiction leads to abuses and hurt others emotionally and mentally.