As many have noted, and the main guides here on Steemit also point out, do not store any pedo-related stuff on your computers, it would be too easy for the powers that be to implicate you for even searching for this stuff. It would be too easy for them to label you as a suspect, when many of them run "honey-pot" sites to entrap you.
With most law enforcement around the world having blanket powers to seize your computers and any storage/passwords you have, it comes as no surprise that we have to be extra vigilant on what and how we do our citizen's investigative work.
The danger is that they own the law, and it does appear that many high-level judges, police, and obviously politicians, may well be deeply involved, they can easily plant evidence on any of us to implicate and silence us.
The "real evidence" you speak of may well be the very same "evidence" used against any of us.