They are real people who also want to live comfortably and be loved by their friends and family. They’ve just been brainwashed and haven’t thought things through enough to brake free from it. So, they believe pretty much anything their cult tells them. It’s horrible and it is stupid, but even smart people believe stupid things some times (even if it’s less frequent).
So fuck them. They're completely useless to a successful society. They can completely be left behind while the rest of us move on without them. No one needs anyone who cannot complete a basic complex thought. If you're too stupid to fucking breathe why should I care about you contributing anything to society?
It's impossible to have a discussion with someone who refuses to listen.