Their governments don't want anyone questioning there judgement on letting those savages in. That's probably why they got Youtube to block it. Or maybe SJW trolls heavily-reported the clip.
I don't think that the clip was removed after they got the orders from the government. The YouTube moderators are leftist enough. Even a number of my videos got deleted from YouTube, and my accounts got suspended multiple times.
Sorry for what happened to you. I've never posted anything on Youtube, I mainly use it as a music player on my laptop. How do you dispute their removal of your vids? Do they like have a platform for creators to do this? And about account suspension, do you get your account reactivated eventually or do you have to do other things?
And now back to said video, maybe you should have included a more neutral description. Often times I see a lot of videos that don't even have anything in their description and I think that makes them suspect.
It'll also probably help if you already have a larger following first when you upload stuff that might trigger them. Basically, play around them. You yourself said they're ultra-left and those kind tend to be very emotional.