Whats all this "we" stuff? You Scotland. We England. 
The fact is, at every game you'll get some trouble. Whether its a couple of pissed up lads fighting outside the ground or a full blown riot or somethng in between.
The fact is, chances are the trouble would have been avoided if that screen had been working. Its like a domino effect, once a few start, more and more will get involved.
I wasnt there so dont know about the transport? But why dindt everyone just walk to the stadium? My gran lives near the stadium and I always walked from my flat to her house. Its not hard to find, go up Oldham Street, turn right and its a mile tops.
And you cant stop all day drinking. Even if the law didnt provide for it, if someone wants to get pissed, then they will.
I think this criticism of Rangers fans is mostly unjustified. Like The Boy says, Manchester City Council just didnt prepare properly and were undone ultimately by a techinical fault which no one could have predicted. Yes, its a mindless minority, but UEFA wont punish them and it will all be forgotten in a few weeks. I imagine it will have zero impact on any World Cup bid, especially when the 2018 hosts wont be announced until 2012 at the earliest.
I will say this, Manchester coped admirably when 55000 Italians came in 2003. And I'll tell you this, that was a fucking much much much worse game than anything Rangers presented this season.