If they really wanted to harass someone they wouldn't introduce themselves as a pedophile in the first place. Because it's revealing all the things they'd want to hide from the members here.

As for your question - I don't think any place on the Internet can be perfectly safe. Everyone can register any number of times under different names using different email addresses and say anything they please - truth or not. Internet is a great invention but it is also dangerous. You never really know who are you talking to. That's why you need to be really careful about what information you reveal to people.