I've noticed a general increase in idiotic aggressive behaviour across the board, in pubs and transport, everywhere really just recently. Booze has always been a driving factor but this is on a different scale. It must be the coke given a lot seem to be hyped up to the max and on a very short fuse. Nasty violent skirmishes have definitely increased also at games, which as football is part of society isn't surprising really.
As you say it isn't on the large scale we saw in the hooligan heyday but some of these cowardly scum now have no qualms in attacking easy targets who aren't looking for trouble and see it as some kind of result and badge of honour.