I think it is similar to how support for Zionism has dropped, even in the islamophobic west, despite the world's most sophisticated propaganda machine's best efforts.

Supporting Zionism when your image of Zionists is respectable men in suits talking about democracy and your image of Palestinians is cartoonish scary Arabs using scary Arabic words. Supporting Zionism is a completely different thing when you have seen Zionists proudly showing off the lingerie they've looted from someone they've murdered.

There will always be horrible evil people but when it comes to it, actually violence is off-putting to normal people. I think showing how the sausage is made, the violence, the hateful cruelty, is always going to be a very effective antifascist propaganda technique.