So I was wondering, like I know it sounds bad, but maybe the short-term solution, as a species, is to not be so horrified when people die. Stop disseminating news and fear about people getting killed and instead broadcast cool montages of those people's lives. Obviously we'll keep supporting medical research so that your life doesn't get cut short by cancer, but living past 80-90? Like you had your time on Earth to live out some sort of existence, waste some resources and contribute to climate change, how much better does it get after you become that old? You can't move around as much, your **** probably doesn't function properly anymore, meanwhile the world's crumbling away at a faster rate and your grandkids can't enjoy a vacation at the beach because there is no more beach. The bigger picture is we have a planet to maintain until we get warp-drive capabilities that are actually feasible to travel to other habitable planets so that we can then enjoy those resources (and start the whole cycle over again).
less people = slower rate of pollution = less political strife for resources = greater regional stability (in areas like Middle East) = more time to develop interstellar travel to planets / transform into robots
On second thought, maybe all these mass shooters are environmentalists in disguise.