I was pickpocketed in 1973 when I moved to Paris. It was pure stupidity on my part. In the 49 years since then, I have never had a problem in Paris, although I have been slightly pickpocketed in Saigon and Mexico City. So I take this pickpocketing fear with a grain of salt.
In Saigon I was just stupid again, but in Mexico City the event in the metro was much more muscular.