They need to belong to a team. A tribe. Everyone wants friends, a social group. Humans are pack animals, we don't do well in isolation. But I'll never understand the "My Team No Matter What" mindset. Life is not a zero sum game. These people believe that if someone else is given something, they themselves must be losing something. Republican philosophy appeals to greed, envy, and selfishness, and attracts those who believe in those things.