> Why not having suicide booths, it's faster to lead humans to extinction.

Actually, many people (myself included) advocate for the right, and plan for themselves, euthanasia as the best, most humane alternative to the current nightmare/torture regime that makes up end of life, hospice, and terminal disease care. This seems like just a logical idea at first, but nothing puts it quite in perspective like experiencing these things in your own family.

The fact that euthanasia is one small way to speed up the reduction of human population down to less environmentally destructive levels is a small benefit.