Is it neccersary for people to be mean to keep dumb people from doing dumb things ?

Yes because if we don't we get caught up in it!

it's more efficient so it saves time. and time after all, is money, what's more important than money?

Perhaps not

No ... it is important for people to be mean to the dumb people ... to distract them and keep the dumb people from realizing they happen to be smarter than the mean people

You mean like pointing out how utterly stupid it is to even consider voting for that lying crook, especially just because she's a gurl? No, not necessary but a public service.