Honestly, for me, I’d refer this to law enforcement. I don’t know what country you’re in, but in the US, I’d go with the FBI.
Tor
The Tor Onion Network
Yea why would that be a matter of "hit report button"? This is proper crime, you won't ever do better than the intelligence agencies can.
I think the issue is that by reporting this to law enforcement, you are admitting you have accessed and viewed CP.
A significant percentage of LEO's are conservatives. They bring their personalities to the job and can decide to charge people, even when it's not perfectly within the spirit of the law. It's safer to remain anonymous and let the companies make that LEO contact.
Don't ever trust a conservative with a badge, no matter what agency employs them.
There is no other way, that's the point. Used the right way Tor hides you.
Freedom is a "double-edged sword", just like control. If you want political dissidents to be able to hide, so will pedophiles.