The stabbing incident at actor Saif Ali Khan's Bandra apartment in Mumbai has brought the focus on security at housing societies in metropolitan Mumbai. Saif's building had two guards at the time of the incident, but neither of them noticed the assailant enter or exit the place.Experts say that the problem is that most societies hire watchmen through so-called security agencies whose priority is to maximise profit and not ensure security of their client's premises thus rendering them totally vul