Because it stops society falling apart and regressing. Humanity is not some angelic, monolith stoic super species, which is just programmed wrong. Its half-sane monkeys which fall apart in a regression as soon as the surplus bribery stops and then try to sew the bakeries oven apart, so everyone has something to eat.

One can not create policies that destroy the thing they want to protect from a crisis to come, by inducing a different crisis by ignoring the material you work with. Trump is your doing, you brought this guy forth, by deindustrializing the west, by making western buisnesses unable to compete. Stop working with idealized paper-cut outs of people- and actually engage, with the species you got. And no, your good intentions and noble goals, do not entitle you to wing it.