I'm trying to remember who was on the popular political t-shirts back when I was in school. Yep, Che Guevara was certainly one of them. Nelson Mandella, Ronald Reagan and Charlie Manson probably made up the balance of the Top 4.
People (especially younger people) have made the mistake of romanticizing Che Guevara after reading or watching The Motorcycle Diaries. Like a lot of idealists, I really think Guevara started out as an idealistic kid with sincere intentions. But power corrupts. And absolute power corrupts absolutely. In the end, he was a stone cold killer who (IMO) got what he deserved.