From the art guidelines :
«Your art may not promote hate towards a race or sexuality, or celebrate / fetishize hate groups. If your portrait of a "sexy nazi" is removed, this is why.»
https://www.newgrounds.com/wiki/help-information/terms-of-use/art-guidelines
Some of your drawings does fetishize nazis. You depict them as edgy characters with guns, that have no message other than "cool guy with red eyes kill people and ennemies". You also make fanart(?) of school shooters.
You also tag your drawings with "incelcore".
From Wikipedia :
«core is internet slang used to refer to styles or trends»
https://en.wikipedia.org/wiki/-core
Incels are not an aesthetic, nor a trend. They're dangerous, and hateful people, like school shooters and nazis.
Nothing in the rules says you can't draw, swastikas nazis, school shooters, or any other kind of disgusting people. Even the most well known game on this site have school shooters who bear swastikas (Pico's School). But the difference is that they're not depicted as "heroes". In fact, the player actually have to kill these nazi school shooter.
that's the thing : don't go draw them as "stylish criminals" (as you put it on your drawings title) or strong people who have to defend themselves against their "ennemies" (like you depict them).
You have free speech, to express your opinions and ideas. If your opinion is "mass murderers are cool", then your opinion doesn't have its place here (or anywhere else really.)
Hoppio
I think it's because of the Nazi symbols (they're illegal in some countries), try replacing them with similar symbols or just don't put them at all