Bobby da Costa had his Mutie wake up call in the last episode. A far cry from being “one of the good ones” in episode one. Now he’s radicalized due to having to learn the hard way.

That said, he did have a point that the Prime Sentinels are that way because they wanted to be. Sure someone like Tish may have changed her mind much later, but I believe everyone who turned was initially for it.

I think Magneto and Prof. Xavier have their curtain call in the finale I’m sure.