Security window bars for tenants in LA, CA

[Tu Anh Nguyen]

Question: do I as a landlord need to provide security window bars for a tenant in Los Angeles if he feels unsafe? Random people have walked in the back of the unit and the tenant is demanding that I put security windows or else he will file a lawsuit with his lawyer for unsafe living condition and emotional distress if I don't do it. 

What I am providing is locks on the front gate so it is this tenant and other tenants in the building's responsibility to lock it. I personally feel that I don't need to put security bars, but am I legally required? I know it is a threat but I want to cover my side legally. Thanks in advance for your recommendations. 

Sincerely

Tu Anh