What was the point of the Chicago Bulls getting rid of Kirk Hinrich and signing Ronnie Brewer?

Ronnie Brewer hasn't done anything, since signing with Chicago. He is one the worst basketball players I ever seen. I don't hear any crap about how he's plays good defense, either. That's a bunch of B.S. We should of kept Kirk Hinrich. The Bulls sure can use him right now. He was a decent defender, a good shooter, a nice per, and a smart player. If you think Ronnie Brewer is better than Hinrich, you really don't know basketball.