I suppose only a few people see the few incidents but they do happen. Out of the tens of thousands attending on a given night, only a tiny minority will be unlucky enough to see the drunken jerk puking his guts up. My wife and I were like you until a few years back and had never witnessed anything. Unfortunately we rocked up one evening to Club Cool to find several guests in tears on the floor and a guy being restrained by another guest after he'd got drunk and attacked people with a pipe he'd dismantled from a backstage area he'd wandered into after getting plastered.
We also saw a group of young adults pushing folk out of their way the other year who were very quickly surrounded by security and one of them yacked all over the floor he was in such a state (not the security but the young adults obviously
).
I guess you'd really have to look at numbers of incidents to decide whether it's a 'problem' or not and establish what the cause of the problem was. We assume the puking was from alcohol whereas it could have just been a virus the guy had, unlikely you would think but not impossible. Like yourself I don't think of F & W as a dangerous place to go full of drunks causing chaos, however I think we have to accept that there can be incidents we don't see or hear of and they can spoil the enjoyment (or worse) for others. The number of incidents must be the deciding factor by Disney, what they are I have no idea though. I've seen two over the last few years on maybe 10 visits but I doubt your average guest would see 1 incident every 5 visits, we were probably just unlucky.