All of them. Beliefs are what makes a person good/bad. Any bad actions come from those bad beliefs, but belief must exist first.

Let me give a very simplistic example. Most of us agree that murder is bad. In order for someone to commit murder they must first believe there are some cases where killing another person is justified or even desirable specifically for them. And not commonly agreed on ones like self-defense.

We even encode this difference in laws. Killing with intention is called “murder”, while if it’s done unintentionally it’s a lesser change of “manslaughter”. Belief is what decides severity of the action.