More Security Problems...

I am a resident of Tiara Apartment, and standing for election for the committee members. At the present moment, we are facing one very critical issue whereby one of our residents ( a bachelor) who is staying alone in a rented unit, last night chopped a visitor's head with a "parang" ( suspected taken some form of drugs). The visitor is actually on the way up the staircase to visit a friend. He was overpowered by some residents and police, and was taken away to the police station.Whereby the victim was taken to the hospital. A check by the police found that in his car have another "parang" and some cable cutter and tools for break in. But today he was released, according to some neighbours. We as residents are worried of this man, said to be just released from jail 6 months ago. What can we do as residents to protect our safety of our family and children ? And what can the Joint Mgt Committee do in their capacity ?