Not that I am saying that gaming is pure but:
Gaming doesn't require your GPU to run at 100% load 24/7
It doesn't burn 8% of national energy resources for printing money
Doesn't directly impact Inflation in the whole world
Doesn't cause chip crisis in the whole world
While you are enjoying earning 80 dollar Euro or maybe even less, per month you are actually losing and also contributing in making every single person in the world lose much more than that.
I see where you're coming from, but do you really think that a couple of gamers mining with their home PCs part-time will make a dent on the economy or cause global warming? It's like blaming me for having a 1.6 L EcoBoost Fiesta ST instead of a base model Yaris or something when others maintain a fleet of Ferraris. I'm not saying that you're entirely wrong, but you're preaching in the wrong choir. Miners who rent warehouses filled with thousands of GPUs will never come to this forum to talk about tech with people like us.
TL;DR: If take the impact on the environment that a single person causes with their home tech and family car(s), and add it up to the scale of the planet, it'll still be an insignificant value compared to whole industries.