It is easy to fall into that trap. My take is that dickheads can be anticipated, though, so steps should be taken, should have been taken, and weren't.
This.
The whole thing was a mess. The solution is to clamp down hard on antisocial behaviour, not retreat and let the 'animals and scum' (as Thatcher and her chum the Luton chairman viewed all foootball supporters in the 80s) get on with it, behind a great big fence to keep them off the pitch.