Food for thought

Inflexibility breeds frustration
Frustration breeds anger

Some people can be very stubborn and fixated in their 'morals' when they can just be more understanding about others and not be so focused on what is wrong and what is right. All people are imperfect, no one is perfect and instead of focusing on the negative sides of people, be more tolerant and not let anger take control of the emotions.

Overconfidence breeds errors in judgement

Yes, some people can are indeed clever. But clever people can also make mistakes. Sometimes, a bit of humility can help them by thinking that they are not always right.