As someone who studies humor as a hobby, I assert:

It’s not that deep.

There is no “hero” in this comic. It’s just a joke that combines two simple/known things:

• Hitler was rejected from art school prior to becoming the infamous figure in all our history books (to put it lightly)
• AI has faced a lot of backlash from people who reject it being used as a source of art

So now the rejected robot artist is implied to be becoming like Hitler as well, by painting a Hitler-like mustache onto its face, after it was rejected from being an artist.

Though it’s worth stating that it’s already basically an existing joke that Hitler became who we know him all as, as a direct result of his rejection from art school in Vienna–obviously that’s correlation, not causation.

Not to mention that there’s nothing in the comic itself that implies the robot being angry at anyone other than those rejecting it–Stonetoss has in the past depicted a character as being Jewish conspicuously (drawing them wearing a Star of David necklace/jewelry, etc.), in service of that comic’s punchline, but no such ‘indicator’ is present on the human doing the rejecting here. That’s obviously a deliberate omission.

I think it’s a bit silly to interpret this comic as endorsing Hitler or the Holocaust or anything like that, and that your perception of him as a person, true or not, has warped your assessment of what ultimately is a straightforward and uncomplicated gag.