I think opinion is not a great word to use because while, yes, people have opinions that inform their world views this is a question of action. Inaction reinforces the status quo, which is bad, and "YIMBY" people believe they have a prescription for those undesirable conditions. I guess if you accept the premise that housing is in crisis then it's not ultimately about what you believe, per say, it's about deciding on what to do. From there I think it's easy to imagine that proponents may diagnose the opposition as having drawn incorrect conclusions about the world around them that need rectifying.