Ignorance.

... i think ... please try to understand.

insanity is sick, madness is holy & healthy (still insane). worst form of insanity is egoism, to me, at least. ego still has uses, can be sane.

too much sanity at cost of others leads to insanity. even if they reverse meaning and call insanity madness and madness insanity. eventually karma returns.

too much of holiness is unhealthy - too egoistic, it separates.