Anger and hatred are different emotions, but they are connected. Anger is one of the easiest emotions to provoke, and once provoked can be easily directed at a target. All it takes is naming a scapegoat, and the cancer starts.

Unfortunately what this breaks is far from easy to repair.

For example, a populist politician seeding doubt into politics undermines trust in the entire system, not just the part he's calling out. He undermines confidence in leadership, which includes his own.