Just goes to show how short sighted some people can be. Make money now, or give up that chance so future me or my possible future kids might have a slightly better world to live in. Now multiply that by a lot and- it's hard.
To many people, the world in which they have more money is probably the "better" world to live in, even if that world as a whole is less healthy.
You assume that the people that use cryptocurrencies also tend to be the people that want kids.
I mined NiceHash for a bit. Made a couple of grand doing it (I also pay for 100% wind power), but I didn't really consider the impact it would have. I saw the $10 to $15 a day for little to no work and took it.