The ban on owning it won't make any difference, it's an understandable knee jerk reaction to the serious nature of this murder.
A ban on distribution is more rational and more effective, as one need not 'own' it to view it on the internet.
I am wary of calls for bans on things that don't actually break the law, as it is a thin end of the wedge to anyone with a complaint.
for example the article says:

"Jane would still be here if it wasn't for the internet."

So using the precedent of banning ownership of the said material it's only a short step to banning or censoring the internet. That's how self serving moral and political 'guardians' get a foothold, and then one is on the slippery slope to '1984'.

"Deaths in the Bible. God - 2,270,365
not including the victims of Noah's flood, Sodom and Gomorrah, or the
many plagues, famines, fiery serpents, etc because no specific numbers
were given. Satan - 10."