Peer pressure, stress, and to forget. Awareness is a good way to educate people of the risks of alcohol. Perhaps help groups could be put in place to help students find better coping mechanisms. There could also be encouragement from other groups to show them that there are plenty of other ways to fit in than to drink alcohol. If you end up dead from alcohol poisoning then there won't be anyone to cheer you on.
Doris estate will be held responsible for her medical bill because that is where she is staying except if she has a relative that would take care of the hospital bill. If not the estate will have to settle the bill.