I think the only way I'd have a Hitler on my shelf would be if he came as a static-posed statue accessory to a Captain America figure where you could recreate the cover:
He would have to always be in this pose, like a mini statue, so that no weirdo's could put him in better positions. I don't know if I would buy it, probably not, but this is just about the only way that I personally would ever own something that had his likeness.
I do have figures, statues and other items depicting Vlad III Basarab, aka Vlad Tępęs, aka Dracula, all over my house. He was a butchering piece of shit that I do *not* admire, but I am fascinated by him.
For me personally, and only for me, stuff like Vlad doesn't bother me a bit. He was a real guy who did really atrocious things, but he's so far back in the annals of history that it almost seems ok? As if he were more fantasy than history. Maybe I'm weird like that, but guys like Vlad, Genghis Khan, Alexander the Great, even Billy the Kid - I'd own all of those because they seem more like comic book villains now than real-world ones. And perhaps that's because guys like Genghis killed so damn many that it just seems unfathomable, almost not-real, so I guess he gets a pass lol Also, for many of histories great bad guys we have movies and media that portray them. We don't make movies about Hitler, except for when he's portrayed as the bad guy. He doesn't get to be the protagonist, and so much of my life revolves around film that maybe that colors it a bit for me.
That's a very long-winded way to say, "I am also fascinated by these guys in ancient history." lol
I frequently wear my t-shirt with that banned cover of Joker and Batgirl recreating Killing Joke iconography: I won’t defend it with my whole chest because it’s a nasty piece of work, but it is my favorite individual issue of a comic ever and has been since I was like ten or so.
This may be a bit of a different story for me personally, since “wallowing in the psychology of evil” is kind of my thing, personally and professionally.
I understand why so many are against The Killing Joke, but I don't particularly share it. I don't celebrate the "women in refrigerators" trope (ironically, that came about much later than TKJ), but the story was never meant to be canon originally so it was an "anything goes" sort of tale. At least something great came out of it (Oracle), even if DC eventually flushed it all away with the New 52.