Because a lot of people seem to think that doing the best for themselves will end up as the best thing for society, or for the planet. Adam Smith dealt with this from the start, there is an amazing moral alchemy in capitalism which allows for improvements in your own life to drive improvements in society, but there are caveats and limits. And ideologues do not like dealing with that kind of nuance.

Unfortunately the impact you have on any of these is in the same order as you list the priorities. That's making it so that if you prioritize planet earth over your family the only change you'll likely see is your family being less well off. That practically guaranteed inaction. That's why we need to enforce good behavior via laws not only on a national but on a global level. It's mindboggling to me that climate agreements are entirely voluntary.