is it weird that to me a lot of the active classes in H.S like the witches and vriska always try to be selfless? despite active classes always being deemed as the selfish one

Well, Vriska’s trying to act like Mindfang through a lot of her story, who’s, as we know, a Sylph, so she’s trying to be Passive to live up to Mindfang’s Legacy. As for the Witches, Jade’s got a really deep connection with Prospit that leaves her very Passive for a while, and while Feferi’s intentions seem Selfless, as we see with Beforus, the Hemospectrum she wants to implement, while better than on Alternia, is still oppressive, so in a way she’s only doing what she thinks is best for others, while not giving them agency of their own, which can come across as selfish. She’s also drained from being Eridan’s Moirail, another mark that she needs to focus on herself to be happy.