Yes, and one of the ways we do so is by the defense filing a motion to argue that the defendant is unfit to stand trial for the time being. I haven't followed the motion work in the case, so I don't know if his defense team made any such claim. But it seems to be that quite a few people are trying to have it both ways - on the one hand he was too mentally fragile to be put on trial, on the other he wanted his day in court to argue for the right to download freely and so the plea bargain with the mild sentence (which would have been served in some sort of minimum security facility) was an unconscionable deal with the devil.

In extreme cases, yes. People are put on suicide watches, but the trials proceed. The bar for being considered 'insane' and 'mentally unfit' is very high. You have people who would colloquially be considered 'crazy' go to trial, represent themselves, etc.

In those cases isn't it due to the fact that the defendant is unable to mentally process their crime, trial, or potential punishment?