Most Helpful Girl
Politicians (not all of them, but a good part)3
Most Helpful Guy
Fear and ignorance.
This has caused more wars and misunderstandings than any other force on earth. Instead of applying reason and logic we apply emotional paranoia and stereotyping of entire groups of people. We begin to have an us vs. them mentality and we dehumanize those who think differently. It's a terrifying force and one of the most deadly cocktails of human nature.