No, just ignorant of the real situation.
No-one from the RBB expects or even wants the police presence and the traffic barricades. It happens because the police seem to think that there will be trouble if they don't show up and guide people through the march.
The fact is that when the police haven't been there the Wanderers fans have, shock horror, managed to get to the stadium ok and not disrupt anyone much.
On top of this, the original march was only intended for a small group, and that number has now grown. In fact, judging by the amount of people who take photos/film it/or just generally watch it go past with smiles on their faces, most people seem to like it.
The police, in their wisdom, consistently show that they have no idea how to handle this, and are the ones that usually make the situation a problem, by doing things like getting people to walk on the footpath even though they are blocking the road anyway with their police horses, or forcing people to walk on one side of the road because they are wearing a Wanderers jersey and therefore must be "one of them", when the other side of the road has a totally empty footpath.
On Grand Final day last year, the police decided that no-one was to walk on the road during the march from Central to the SFS. Of course, that meant that they were overbearing wankers and stopped people even so much as walking in a lane with parked cars. The fans eventually tired of being treated like children - it was making the walk take 4 times as long as it should have - and through sheer weight of numbers poured out on to the streets. What eventuated? Well, yes, traffic was stopped for all of about 5-10 minutes, but in fact quite a few locals came out to take pictures and the "marchers" interacted with people in their cars by pretending to clean their windows etc. It was all in good fun, and people got on with their lives afterwards. I reckon I could have a stab and say that no-one's life was negatively affected by being 5 minutes later to wherever they were going on a Sunday afternoon. In fact, some were enriched by the experience.