The most likely scenario is that the Police were running a honeypot and tracing every IP that connected to it. Obviously this would pick up a lot of TOR exit nodes. One of the exit nodes is in their jurisdiction so they pay it a visit on the longshot chance that the exit node operator was also a pedophile.
If they knew he was running an exit node it smells a bit like a fishing trip, but since they didn't send the SWAT team in through the windows and hold his computers for 4 years out of spite (the Steve Jackson treatment) I have trouble faulting the cops too badly.
If they knew he was running an exit node it smells a bit like a fishing trip, but since they didn't send the SWAT team in through the windows and hold his computers for 4 years out of spite (the Steve Jackson treatment) I have trouble faulting the cops too badly.