Roses are red, so are communists, Hitler is evil, but on an unrelated topic I love you.
Love is the greatest dictator of all, they say, and you have to do what it commands. So why not show your love with one of these horrible, horrible tyrants who made the 20th Century an unending bloodbath like nothing that came before! Here are some cards that say "I love you so much it's caused me to lose all sense of perspective when it comes to making light of the deaths of millions." Just make sure your beloved is good at appreciating un-PC humor, otherwise he or she will feel as lost as Karl Marx (and to a lesser extent, Trotsky) must feel, wedged among all these people who actually did (terrible) stuff.