Life is inheritly expansive and colonialist. The trees war the grass for the light by throwing shade. So people have these little plot-armor, little stories justifying endless expansion- having three kids, who consume thanks to modern industrialized society energy and nutrients like a medieval village and do the same. Without these "Im-good" self-repairing stories, people would stop having kids and wither and die. To demand people to be rational there, is to start a death cult.
These whales sing songs about how sharks have no souls and the metal fish dwellng on the surface mauled there ancestors.
Surely you realise that there’s a balance between “stop reproducing and die to avoid harm to the world” and “consume all resources available for short-sighted gluttony”.
There are absolutely ways to lower our impact and lots of smart people working on figuring out how this can be made to work at scaley