Well I said 'one' of the reasons, but just glaze over that part and dismiss it outright, eh?
I agree that policing and stewarding is well over the top on occasion and that football fans are an easy target for the police. However, guys like those in the story do the rest of us no favours whatsoever...they are partly responsible for the way that football matches are policed in the UK. If they continue to act like this while representing Aberdeen FC - it'll be the rest of the support and our club who will suffer because of it.
Rugby fans, eh? We'll I've been to the rugby plenty of times and I've not seen any of the behaviour that I've witnessed at football matches. Drunk, yeah probably. But have I seen rugby fans launch assault fellow fans? Have I seen rugby fans, walk the streets in gangs after a match looking for a fight with opposition? Or harrass other folk on trains or on buses, throw bottles, assault bar staff etc.? I've seen all of this at the football, and with Aberdeen FC. In my experiences, I have seen far worse fan behaviour at the football than I'm ever likely to see watching egg-chasers.
These guys may be Aberdeen fans. Many of them probably are not - I couldn't really give a monkeys. The fact is that they have been convicted of violent offences and punished accordingly...and quite rightly in my opinion.