BaggeByTheSeaWas K. in The Castle really the Land surveyor they sent for, or a con man pulling a fast one?
If so, would that change how we read him? He would still be stuck in a horrible bureaucracy, but it would be more of his own doing - and he would have a higher degree of freedom to leave.
Same with K. in The Trial. Was he really as innocent as he claimed? Would that change our reading?
Even if he was guilty of a horrible crime, the titular Trial was unjust and inhuman - and for me that's the true horror of the story. The trial would care as little of his guilt - were he guilty - as it did about his supposed innocence. Not even such a fundamental part of his own personal history as his guilt or innocence would give K. any power over the process.