I took the liberty of rewriting a couple of your sentences that I particularly liked:

Egomaniacs are oblivious to everything that does not serve their obsession to seek advantage at every opportunity. If somehow the overwhelming majority of the human race had managed to evolve beyond the blind-ego mentality, malevolent shysters like Adolf Hitler, Jim Jones and Donald Trump would be out of business.

I hope you don’t mind if I use it myself from time to time.

Thanks.