This is tricky and sensitive. They're pure evil, racist idiots, by the way I'm sure they're also sexist, homophobic, etc.. However, the Red Skull, a World War II actual Nazi server of Hitler, has multiple action figures. Thanos is a genocidal mass murderer on a galactic scale. He has who knows how many different figures. In my FF display, I've got a 3.75 figure of Hate-Monger in costume as a Fantastic Four enemy. Doesn't he claim to be Hitler himself ? Doesn't mean he is, but he's pure evil. Aren't most of the Invaders enemies Nazis, Nazi sympathizers, Neo-Nazis ? In "One World Under Doom", Dr. Doom dropped a nuclear bomb on a city in upstate New York. He had to have murdered thousands of innocent people, including babies and children. Doom is now likely the greatest mass murderer in Marvel Universe American history. Multiple states in America still have the death penalty. I'm mostly opposed to it personally, but once fictional Doom is "dethroned", doesn't he deserve to be sentenced to death in an American court ? The diplomatic immunity card he's played in the past shouldn't hold any water under these circumstances. Back to the Sons of the Serpent, I would likely buy one or two, either as depicted in the green costumes in image two or their original appearances Avengers garb. They'd get put alongside other Avengers enemies. Part of what WW II illustrates, along with certain individuals in the contemporary world, is just how mundane evil can truly be.
