Lots of great opinions on this thread. The fact is that it is not as simple as pour less/police more/charge more...
First thinking that Disney World is aimed at little kids is NOT true. Saying that Epcot is geared to little kids is even less true. Epcot is the more grown up driven of all 4 parks.
Disney makes a TON of money off of alcohol sale, that's why these "festivals" keep popping up and adding more and more food and drink options
There is a much heavier and visible presence of Orange County police, not Disney security, but actual police, during F&W. For example the other day I watched Illuminations standing right next to 2 police officers (I was behaving, I promise
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I can tell you that horrible, drunken behavior is NOT the norm. You can see people being tipsy, loud and a bit rowdy, but on a day to day basis you won't see people puking in bushes or dropping down drunk.
I have seen 3 drunk young guys actually going int the Fountain of Nations area (not the actual water) and getting caught almost instantly by Disney security and police
I think the problem with the OP situation was that they were inside a bus, no options to walk away or head in the other direction. There should be more security presence at the bus stop, especially during F&W and not allow people to use the buses if they are this drunk, it is endangering everyone in there.