Why is it unacceptable? One should always be willing to sacrifice self for the good of their neighbor.
The fact that P. Filaret refuses to resign just shows he's not worried about his flock, just himself.
Unfortunately yes, and so unity will come faster the sooner he leaves the scene.
I read the Ukrainian article via Google Translate (yeah, not perfect, but with a dash of common sense and background knowledge it can be enough to indicate what most an article means). It seems that UOC-KP also did something even more damaging: it called upon UAOC priests and communities to jump into the UOC-KP on their own.