Well, this is a stupid article.

Police are powerless to remove an online suicide video.

Why is it stupid?  It's claiming that the police can not remove a video of a 12 year old girl committing suicide.

Well, duh!  Polk County PD (Georgia) only has authority in Polk County.  They do not have National nor International authority.  What they are doing is requesting that the various websites take down the video after it is posted, which those websites are doing.

On that note, court orders can be requested, but they only work on each individual event.  Not a broad brush ban.

Now why can't they just block everything all at once?  Because once it's on the internet, it is out there forever.  Anyone can make a copy and post it on almost any social media website.  And if they have their own copy of the video/photo/music/et al., they can just upload it whenever they want.  At this point, it becomes a game of Whack-A-Mole.