Why all the Focus on Purim?
Why the acting as if Purim is the Problem?
Purim is NOT the problem, CV. The problem is the lack of supervision that happens on purim. When you have lack of supervision on shabbos, Chasunahs, etc. (via parents not taking responsibility for their children), the children drink as well.
It just happens to be that Purim is a time where those who usually are responsible for the bochrim (Their Rabbaim, yeshiva, and sometimes even their parents) refuse to take responsibility.