I'm not sure I understand your point, can you explain it?

'Taking something at face value' means accepting it uncritically, but sometimes skepticism is warranted.

I understand the saying, I don't understand the point. Is it that the "victimology" is completely feigned and contribute nothing to attract more people to their cause? I'm sure a lot of it is feigned, but they keep doing it because it works.

Yes. Obviously it's impossible to assess every anonymous poster but examples abound of IRL right-wing extremists who use this as a gambit but whose private chats etc. reveal their insincerity.