I find that a lot of folks start with very strong disagreement; and eventually it turns out (my interpretation, possibly horribly wrong!) subconsciously they resent feeling blamed or judged or moralized for just living. And fair enough. But for me, the key part is a very selfish perspective - something is happening that's bad for us, we are making it to some degree or another worse, and there's a clear optimal place on a curve of economic activity vs life stye vs future of species, and I don't think we are on the selfish optimal spot, let alone some "global earth/gaia-perspective multi-species well-being of all life" optimal spot.