RE Copy and Paste
"Could you imagine getting hold of these URL's and wanting to pull a few pranks?"
That's the whole dilemma. It's similar to someone being able to spoof a phone number in order to call in bomb threats to a police agency.
The problem here is that FBI is actually promoting the ability and the tactics to smear someone else.
I'm glad they are doing this to capture pedophiles. On the other hand there are many other ways to capture criminals that don't PROMOTE criminal behavior.