Being a jerk gets you rich, promoted, and laid (if you're a man). But there is a downside.
Being a jerk works. It's been shown to get you more money, greater promotions, and more s/e/x (at least if you're a man). Being aggressive, manipulative, and rude will mean you get your way more often. But while being a jerk might lead to personal success, a society full of jerks would quickly fall apart. Humans are wired to trust each other. While jerks may thrive initially, they risk being outcast when their true nature is discovered.
https://bigthink.com/neuropsych/jerks-win-battle-nice-guys-win-war/