Is there an analog for an extinction level event of our own creation and which persisted because of a variety of absolutely crawl reasons even after denial became the domain of idiots?

This brings up an interesting point. The snap would have to run a multi pass check to make sure that by killing half of all organic life, it’s not causing the other half to die off. Otherwise, it wouldn’t be confirming to the will of the user, but then does it “scan” individual life types independently or as an ecosystem unto themselves, in which case is there precedence? Do food producing things get a pass, because otherwise the snap is just shortcut the process for half of the population. If it does leave the food producing ones alone, then really he’s just snapping away apex predators.