Looking at the images you posted, I’m unclear how this works; is Facebook actively claiming copyright to the video uploaded by a user of a murder???
Boy, that sure seems like an invitation from Facebook to the family to sue the ever living fertilizer out of Facebook.
I don’t know about copyrights regarding Facebook....I don’t do facebook....but if you post there nothing’s private and anyone can grab what you put up, and do, as far as I know.