I'm going to leave my friends to swim from the canoe to shore
Why do you want to leave your friends to swim from the canoe to shore?  Are you sure that they can control the canoe alone?  They might get hurt if they don't know how.
I'm going to teach my friends a lesson about their behavior being so abusive to me
It's wrong to just ditch your friends. You should not leave them behind to swim to shore like that. It's might be dangerous.
My friends deserve it and they are assholes. Nah, fuck them.
I trust and believe you that they were mean to you, but wouldn't forcing them to swim to shore like that be dangerous? I bet you will feel good about it and I get it, but I worry that they could drown and you will end up getting into trouble. I hope you reconsider because I know you are a good person and forgiveness is part of your nature.