I'm going to cut someone else's bike lock
Why would you cut someone else's bike lock?
I'm mad at them because they took someone's bike and claim that it's their bike.
I know that your angry that they stole someone's bike and are using it as if it's theirs, but cutting the lock isn't the right way to handle the situation. You should report them to the police and let them handle the theft case.
I make my own rules of the road. I will handle this myself.
Even if they stole this bike, the bike lock doesn't belong to you either, and breaking it is the destruction of someone else's private things. Don't get involved in this and keep your eye on your own road.