Nobody argues that families shouldn’t have the right to pull the plug on someone in a vegetative state in the political realm. That’s a purely religious discussion; I don’t think any significant portion of the goyish world views that issue the same way we do.
Some issues are no longer on the table politically as precedents have already been set. I would imagine that liberal Jews would say that after Rowe V Wade, there is no point in arguing about abortion in the political sense. It’s not an entirely bad point because neither party is actually talking about a wholesale ban on abortion.