Fair. I would have thought the same myself, had the show not gone out of its way to either change the circumstances around Dany's atrocities so that she's the one in the right (to be fair this isn't exclusive to her, Tyrion has a pivotal scene changed from him murdering someone in a fit of rage to killing them in self-defense for example) or to outright delete those atrocities. If the intention was to portray her as the villain all along, they've got to give her actual villainous stuff to do instead of just the occasional ominous remark & chords; the latter is just poor storytelling (or in other words 'show, don't tell').

That organic buildup over five books is why I can believe Book Dany would turn out to be a psychotic warlord in the end, but why Show Dany's turn weirded even me out despite my not liking the character or the show by then: she's just overall far more arrogant, ruthless and entitled in the books, and does a lot more that makes her less likable. The way she was set up on the show, however, left me with the impression that D&D were trying to make her into an unironic progressive messiah until the very end - and when that end came, how the heel turn was done was 'subverting expectations' bullshit that was also a total anticlimax for the character's arc until that point, as was the case with pretty much every other major and middling character on the show.