FB has algorithms, this picture is simply in the algorithm, hence the automatic ban. Nevertheless, punishing for unreported PRIVATE conversations is, in my opinion, worse than very incorrect and disturbing.
Added after 4 [minutes]:
I`ve touched on this topic before, although not on the internet, but let me quote - nothing on the Internet should be taken seriously, especially from unverified, unverified sources.
Common data leaks or simply spoofing on the Internet and someone can get the police on your neck through stupid Facebook.
I can brazenly say nonsense on the Internet, such as that I keep 20 dead ladies of easy virtue in the basement and no one has the right to take it seriously, it is in no way proof of anything, especially since you can`t "feel" sarcasm in the tone of my voice on the Internet :)
Hence, in my opinion - what`s the point of not being anonymous online if no one can prove to you that the post on your account was not shared by a third party who somehow came into possession of your account login details - especially since Facebook does not share such data to law enforcement agencies (except the FBI and CIA).