I want to take karate lessons so I can beat people up
What is the reason for wanting to get into karate?
I'm thinking of taking karate lessons in order to sedate my anger.
I think that you should be doing it for the right reasons, to combat your anger! You should not study so hard at this just so you can get revenge on people.
Do you think you know better? You need to toughen up.
Taking karate lessons is a good way to vent some anger but using it to beat people up is not a nice thing to do.