Well, that's pretty odd because I've noticed the phenomenon Chess Man cited for myself. I've also passed a mosque on Nolensville Pike many times and saw its parking lot filled with taxi cabs.
You have every right to bury your head in the sand but please don't discourage citizens to ignore what may (or may not) affect their security while we're at war with radical Islam.
There are a lot of ME cabbies in Boston.
The late Mr. Atta is probably the most well known.