Yes, being safe is good. No, being INSANELY paranoid is BAD.
Here's PeerSniper, for PeerGuardian OSX removal.
Hah, I should have done more research.
Apparently that PeerGuardian OSX was a pretty crappy attempt, according to the forums at phoenixlabs... And thus, here's PeerProtector!
http://forums.phoenixlabs.org/showthread.php?s=81de309e984c7c934d196e0e316911f5&t=10229, linked from http://forums.phoenixlabs.org/f65-peerguardian-osx.html
KLT Mirror: http://www.softvb.com/hosted/PeerProtector_1.0.0.zip