People should be wary of everyone they play, not just for the fact that a few bad apples cheat, but also because people make play mistakes during long tournaments.

Some people make more than others. Sam Black isn't known for his play mistakes, certainly, so I don't see how that comparison is relevant. Knowing the names of people who make a lot of "play mistakes" seems prudent if you're going to attend a tournament that has a large prize pool.

We could discuss our opinions on whether or not penalties fit the crimes, but we all know how pointless that is. Making sure everyone is aware of who to be more wary against is all we really can do, unless any of us are high up in the WotC DCI employee chain.