If you have only one passion in life - football - and you pursue it to the exclusion of everything else, it becomes very dangerous. When you stop doing this activity it is as though you are dying. The death of that activity is a death in itself.
Often there are players who have only football as a way of expressing themselves and never develop other interests. And when they no longer play football, they no longer do anything; they no longer exist, or rather they have the sensation of no longer existing.
The pressure people put on themselves and the rivalry between the teams is much more marked. And I think that's a good thing. As long as that rivalry remains within the spirit of competition, it con only spur everyone on.