Trying to force peace just makes you lose yours and pushes others further away from it.
They have to let you teach them peace, but most people are too afraid to let their guard down for that.
You have to understand that most people have experienced a lot of pain in their lives. Life hurts, and there are always new threats around the corner to scare us.
I think the solution is to do what you can to help them not feel so afraid and hurt, but you can't reach everyone. Some people need help that we don't have the capacity to provide, or are so hurt that they won't accept the help they need.
I truly think that humans were wired by evolution to seek out peace, so I think you should be more understanding with people that you might think aren't committed enough to finding it or aren't making the progress you think they should. There are probably real problems in their lives that are proving to be powerful obstacles for them, and they aren't always easily dismissed.