That is why we need to cultivate virtuous deeds. If we do not, we will not feel at ease How do we cultivate virtues? We have to actively pursue the good, not just simply refrain from wickedness. Not only must we not kill, but we must also save lives: the lives of humans and creatures. That is why Buddhism teaches us to be vegetarian, which is the ultimate way to save lives.
If we also liberate living beings, we will cultivate our blessings.