We are all a lot like Peter. We want to know what God's going to do with sinners, and those we feel have betrayed Jesus. We have a morbid sense of curiousity about what punishment these sorts of folk will receive. It's this sort of curiousity that makes channels like Court TV such a big draw.
People are on trial, their futures are on the line.
We want to know what will be done to the guilty. Jesus stops Peter short when he answers this question. We are so eager to make other people's lives our business that we forget what we're supposed to be doing. I get letters daily from people who say they know what God will do to me, because they see my sexual orientation as the pinnacle of sinning. They are certain of the punishment I will receive, and they seem to take a certain joy in spelling it out for me.