had no trouble at glasto the 3 times i went, is this just a northern problem? 
Glasto changed because of this very reason, higher fence more cops different line ups.
The year Oasis played (95 i think) it was a manc rob fest then year after year they had bands which attracted a criminal element culminating in several stabbings and a mini riot.
The commercialism and CJA influenced the path of festivals away from alternative/leftfield fan base into a mainstream event, this brought with it the usual blight.
Any way I never take what i cant carry on my person all the time, and i only have a cheap tent and bag which gets chucked in September.
Sorry about your misses OP, i would be well pissed off

I am glad I got to do them when the only bad thing to happen was buying paper that was supposed to be acid

Some of the traveller types were a bit hairy and the odd tent got turned over, but for the most part it was peace and love.
In my opinion glasto is still the best, different crowd now but the safest environment to enjoy yourself.
Wonder what the bulldog bash is like now?
