I just finished reading X-Force. I've only been reading X-comics since HoX/PoX, then went back and read some arcs from the last 20 years, but for the life of me I still don't understand what's going on with Beast. What the fuck is going on with him? When did this start? I always thought he's the genius good guy who would inadvertently cause people around him harm, in a FF Reed kind of way. But the he's acting is more akin to alternate reality Reeds. What's even more jarring is how no one is questioning or standing up to him. At all. I guess until Wolverine's punch.
When writers don't bother explaining a character's morality or evolution of morality, they stop being fun to read. The notes they added aren't enough. I still don't understand his leaps.
During Bendis's run he became obsessed with showing Cyclops how wrong he was. So he basically broke the timeline by bringing the original five X-Men to the present so they could see how bad Cyclops is now.
He did this why all of reality was starting to fall apart because of things like... People time traveling frivolous.
He then refused to send them back.
And that was the beginning of his fall. He was so upset that his lifelong friend had done things he didn't approve of that he began to lose his own morals trying to show Cyclops how wrong he was.