That's very clever, and I would actually get one if it wasn't for the fact that I do know who he is haha.
But not to worry... 2008 brings movies The Argentine and Guerrilla which is about Che's life, so then people will understand the shirts they are wearing... and most likely discard them know that they know what really happened
(or just say "yeah the movie is cool huh?")
Btw: That website is awesome... well half of it is about the presidential election or being a patriotic american, but some of it is quite brilliant.