I think I understand.
Well, if you find it too stressful to stay, and watch what happens to a group you have been part of for a long time, then you probably are better off leaving. Life is too short to be part of something that upsets you. You'll find another place to belong and grow to love it, I'd bet.
I just think it's sad that things come to this. Yet, I also believe that things tend to work out in the long run. As I stated on the Elephant thread, groups have a way of evolving.
Forums are just a microcosm of the world, really. "Can't we all just get along?" Apparently not, and more's the shame. We're all the poorer for it, IMO.