Yes. The goal is not to get the rapist off, the goal is to make sure the process is working correctly and the plaintiff has done their due diligence.

Someone has to or there can not be a conviction. Clearly guilty is something that can only truly be said after the decision.

Unless you want to completely overturn the way criminal trials are conducted in the Anglo American judicial tradition.

No. Tons of lawyers never even touch criminal law. You do not need to be a defense attorney to be a lawyer.