Cops are known to frequent kiddie porn sites and to be wise to kiddie pornographers' network habits. For that reason, any terrorist truly interested in operational security would avoid kiddie porn!
The only possible explanation is that the Mooselimbs are perverts who truly dig kiddie porn in and of itself, just like their Prophet! And some of them are stupid and undisciplined enough to risk getting caught by mixing business with pleasure!
Here’s a quote that indicates a diversion ....
“The findings were deemed as unrelated to the anti-terrorism probe and thus not investigated further.”