It's not the Church's place to 'forgive' crimes... or cover for criminals. That's the job of the State - our court systems and laws.
Matthew 22:21 Jesus said "Render to Caesar the things that are Caesar's; and to God the things that are God's."
The Church can offer spiritual assistance... and like I said, that can be offered just as easily to a person in prison as any other place.
Absolutely. Without question.