We don’t know if trying our best will help, but we do know, that if we don’t try our best, it won’t help for sure!
I don't think it's good to never get angry. Just like about the other 7 sins, right? If someone didn’t have any pride, wouldn’t they also be lacking in self-confidence? If someone was free of greed, wouldn’t they have trouble supporting their family? And if people didn’t envy one another, wouldn’t they stop inventing new things?