Warning: spoilers for M.O.D.O.K.: Head Games #2 and Juggernaut #5!
Marvel Comics just revealed that two notable characters with less than heroic pasts (and questionable presents) have something in common. While MODOK may be the head of Advanced Idea Mechanics as a Mental Organism Designed Only for Killing, and Cain Marko's Juggernaut is an unstoppable force seeking to find his place in the world, both of them share the same rule and line they won't cross. Despite their dark pasts as villains, there's one group that neither of them can condone or work with: Nazis.
In Juggernaut #5 from Fabian Nicieza and Ron Garney, Cain Marko has been trying to find his purpose in life with his new armor, starting a path potentially towards redemption and away from the selfish villain he once was. After getting his young mutant partner D-Cel to safety with the mutant nation of Krakoa, Marko turns his attentions to building an unstoppable new team by the end of the issue, featuring Quicksand and a plastic android known as Primus, a creation of Arnim Zola. While Zola himself is present at the end of the issue, it's made clear that the mad Nazi scientist will not be a part of Juggernauts' new team, despite being a huge potential asset with an ax to grind against their mutual enemy, with the next issue announcement and Juggernaut's comments in previous issues making it plain exactly why.
MODOK is even more direct in his hatred for Nazis in MODOK: Head Games #2 from Patton Oswalt and Jordan Blum. Needing to get his brain repaired, MODOK turns to Tony Stark for help, as AIM has turned against him. Going to a villain expo to find the piece of stolen Stark tech needed to get the job done, MODOK and Iron Man go undercover, and MODOK coincidentally disguises himself as Zola (who's really the only other villain MODOK could possibly be disguised as). However, the other villains at the expo soon learn the truth, leading to a massive brawl which sees MODOK headbutt the Nazi villain Hate-Monger with extreme prejudice, yelling, "%#$@ you, Nazi!"
In both cases, it seems Marvel is taking the smart route of making it clear that while these characters are super-villains whose crimes have hurt many, they still exist within a moral framework containing greater evils they're steadfastly against. It's a trick that's been used before to debatable effect, with even the worst of the worst villains from comic books such as DC's Joker hating Nazi villain Red Skull during a crossover story. Joker has gone on record multiple times, making it clear that while he may be a deranged and homicidal psychopath, he's an American homicidal psychopath.
While it's important that comics not trivialize the Nazis, especially to younger reader, it's good to see the distinction made between more playful, rebellious villains and more relevant forms of evil, especially when those characters make the distinction themselves. It's also just fun to find something that Juggernaut and MODOK have in common, despite being very different characters in Marvel Comics overall.