[WhyCause]

> ...you can't control what others send you.

Of course not. You can, however, control what you then do with said data.

If a courier accidentally dropped a folder full of nuclear secrets in your mailbox, I promise you that if you do anything with it other than call the FBI (in the US), you will be in trouble.

[gruez]

Except in this case it's unclear whether any intentional decision went on at meta. A better analogy would be if someone sent you a bunch of CSAM, it went to your spam folder, but then because you have backups enabled the CSAM got replicated to 3 different servers across state lines, and the FBI is charging you with "distributing" CSAM.