Let's say I decide I have to break up with my live-in girlfriend, for good and sufficient reason. Perhaps she banged my three best friends, perhaps she literally killed my dog with an axe. Doesn't matter - I have my reasons. I break up with her. I still have to give her back her stuff from my apartment. If I don't do so, I'm committing a separate offense of my own. I lose the moral high ground.
Maybe something has to be worked out - maybe a friend of hers has to come over and get it, maybe I put her shit in boxes out on the porch. Whatever. I still have to give her back her stuff. The courts agree, public opinion agrees, the police agree. Whatever she did, no matter how egregious the violation, my swiping her stuff is FUCKING FROWNED UPON and is not justified by whatever harm she did to me.
Google demonstrates no knowledge of this legal and social norm. That's what is pissing people off. Implement a system to let people download their data from closed accounts and you can delete accounts with no explanation all day long.
Stealing people's data - regardless of what they did to you - is something that most people consider to be evil. Nobody cares about whether the guy did anything wrong or not. He's seizing the moral high ground from you because you, also, have committed a wrong.