A CNN crew was robbed in San Francisco while reporting on the rampant crime that has plagued the city.CNN correspondent Kyung Lah took to Twitter on Friday and detailed how their rental car was vandalized as she was conducting an interview at City Hall.“Got robbed. Again,” Lah wrote. “[CNN producer Jason Kravarik] & I were at city hall in San Francisco to do an interview for @CNN. We had security to watch our rental car + crew car. Thieves did this in under 4 seconds. Security stopped the jerks from stealing other bags. But seriously- this is ridiculous.” San Francisco has …