i've read a lot about pick pockets and other petty crimes in paris on the internet(yahoo)before we went there this summer and so we were very very careful about it. we were there for 2 weeks and to our surprise we didnt encounter anything like it aside from the small incident at the eiffel where a cop was running after this illegal vendor.
i think what i have read in the internet was a bit exaggerated. we truly enjoyed our stay there and hoping to go back there someday.