Obviously the 30+ years prior to 2010, when militant anti-fascists were active, were immaterial.
As for "waded in fists first", I very rarely saw anti-fascists start aggro at demos. Your recollection may be different, but then as you were probably legging it while they stopped the fascists attacking you, you wouldn't have seen anything, would you?
Do yourself a favour. Do some research on the constituencies where the BNP "faces" stood. Look at the canvassing operations that took place there. In every constituency where a BNP "face" stood, and most plainly and publicly in Barking & Dagenham, those constituencies were blanket-bombed in the week before the election by a coalition of trade union members, UAF and HnH, Labour and non-aligned anti-fascists pushing an anti-BNP ticket. In most of those constituencies, the vote was higher than average. Do you know what that means? It means that their support hadn't collapsed, it'd been overwhelmed. BNP support and membership didn't start to fall off until late 2011/early 2012, after Griffin's financial chickens came home to roost.
Your argument only works if you're entirely unaware of the history of the BNP, and of the fact that from the early '90s on the BNP progressively withdrew from their "street soldier" strategy, and adopted an electoral one instead, causing militant anti-fascists to scale down their own operations. The change of BNP strategy allowed Griffin to siphon off his boneheads away from the BNP. The BNP had very little opportunity to play the victim, because militant anti-fascists were more interested in heckling the self-styled "democrat" than feeding his martyrdom complex.
You really are absolutely clueless.