Victory fans are a joke
Why, exactly? Without the Vuc fans, this league would've probably died a horrible death by now.
I had big problems with WSW's firecrackers because of the sound they made - sounded like bombs. I was at the game and they scared the shark out of everyone. Flares don't scare anyone. Sure, it would be better if they weren't let off for the simple fact that it brings negative publicity to the game, but if you've ever been to a Victory game at Etihad or AAMI you will know that 1. they do add to the atmosphere and 2. most people don't mind them.
Of course, saying all that - they aren't legal and shouldn't be let off either way. Even then, though, it's only a group of 10-15 people out of 25k members or so that ever do it anyway.