They won't Its a combination of the mental illness that caused their weight gain, and the brain damage caused by their weight gain.  They are insane, narcissistic, and mentally deficient. They should be marginalized from society before they cause damage, but idiotic academics have worked hard to prevent this.  The most we can do is wait for this to hit critical mass, and find a way to not be hurt by any social damage that they do, and in fact profit from it.