I think the point is that the police have a database of people who have not and are not likely to engage in any kind of criminal activity, but the existence of the list could potentially be used as evidence if that did happen.
As an example, imagine I sign a petition online. Without my knowledge, my name gets added to a list and ends up being circulated around a police department because myself and the others on the list are suspected of doing something illegal, either now or in the future. A few months later I am accused of committing some kind of crime. Whether I committed a crime or not, the police department has a list with my name on it that has been floating around to be called on in this exact situation.
Not to say that this isn't worth noting but this has gone on for decades. It should be expected that if you sign a petition, you just put yourself on a list you didn't expect.
Sooo trolls made a list to troll far left folks and they got their hands on that list and trolled themselves.
I think that goes to show:
The left really can't internet/meme/whatever
The term "gone full retard" applies.
A great laugh to launch the weekend. Thank you.