Oh absolutely, there is no expectation at all that you should have to stay and fix the place. It's admirable of those who want to try, but I'm a firm proponent of saving your own ass first. If you're LGBT in a red state, I'd honestly prefer you get the hell out of dodge than stay and try to fix it.
I grew up in Missouri and I lived in Houston for a couple years. I feel no obligation to fix Texas. I don't feel obligated to fix Missouri, although I want to. If laws come out targeting me and my loved ones though, then I'm heading out.
I greatly respect martyrs because I don't think anyone should ever try to be one. I care way too much about saving my skin, selfish as it sounds.