Killing in Return
I dont think anyone should kill anybody although they killed someone else. Just because someone kill, doesn't mean you have the right to take that person's life. At the end of the day, you're in the wrong. You are no better then what that person did. You should leave it in God's hands. He's the one who judge on judgement day.
Striving for Power
It is natural for humans to strive for power. What humans doesn't strive for power? Many humans strive for power for many different things. Some humans strive for power with everything. They just want to have power over everything.
An Guilty Accomplice
I think an accomplice is just as guilty as the person who commited the crime because they shouldnt even be around the crime. You should never want to help someone commit a crime. If they want to commit a crime let them do it by themselves. An accomplice is as guilty because they should know better and ran the other way instead of sticking around.