This is the kind of straight up obnoxious bullshit I can't stand. Nothing excuses this shit.
Obito loved Rin. Madara found out and arranged for her to die before Obito. That was his downfall. It broke him.
This was all according to Madara's plan to break Obito by taking away his hope and then reshaping him in his own image. Obito was more than just a pawn, however, and while he studied under Madara, he became disillusioned with the world, specifically the shinobi system, i.e. a world of winners and losers that had branded him a loser and made him suffer. Obito actually believed that the Moon's Eye Plan was a good idea. The war itself was just a means to an end.
Sure, it all started with the death of the girl he loved, but to dismiss everything surrounding that and just be like "lol Pedobito thirsty af for Rin!!" is just insulting, and aggravating.
Every villain has their trigger, the thing that causes their downfall. For Nagato it was the death of Yahiko. For Obito it was the death of Rin. For Orochimaru it was the death of his parents. I can keep going. I just find it unfair that Obito is singled out as being some kind of terrible character for committing atrocities because, at the roots of his villainy, it all started with the girl he loved dying. Often the same people will speak highly of Orochimaru in the same breath, even though that motherfucker killed children in his quest to become immortal after his parents died. The double standards are frustrating. As is the ignorance. It's like people forgot Obito was playing the shinobi world for years under the guise of the masked man and Madara. Now all of a sudden he's supposedly this inept, incompetent fuck? Give me a fucking break.
Hate the character all you want. Just don't propagate bullshit.