Can a landlord be held responsible for thefts when you've previous complained and nothing was done?

You need to secure your Apartment, You can't hold your landlord liable, I got robbed could not stay there I moved and the landlord would not give me my security back, I told him verbally that I was leaving, Then he told me I had to give him a written letter, I'm sorry, When somebody else moves in drop them a note telling them that the landlord is trash.Good Luck.