Possible… I'll go with the bees, after years of guilt for enslaving humans to care for them realized the only way to free the humans was to kill themselves, so

Possible… I'll go with the bees, after years of guilt for enslaving humans to care for them realized the only way to free the humans was to kill themselves, so they hired a hit from Craigslist to end their existence and free the poor humans from a lifetime of servitude.