A Suggestion
GG, Jan as you work to get Casa Linda to change security companies, if in fact it turns out that Protecto watchmen were culpable I had a thought. They probably won't do it but I would certainly demand it if I were in any project where this happened.
Ask them to require a cash bond from any new security company that's hired, or especially from Protecto if they are retained. Make that company put a couple of thousand good old U.S. Dollars down on the table if they want the contract. Then in the future if anything similar happens again and the fault is traced to the security company either through the direct action of it's guards or through their indirect actions such as by incompetence, that money can be used to pay the damages of the victims like an insurance policy. Alternatively the company might be required to pay and maintain an insurance policy holding any resident burglarized while the company is on duty harmless and paying their damages.
P.S.
Jan, what gets my hackles up is a company that doesn't recognize just exactly who's ultimately paying the bills. I work daily with hundreds of clients who break things, mess up software, etc. and come to me for help. I fix it, I don't tell them it's their fault you handle it. Why? Because I realize every bottle of champagne in the fridge, every diaper on my kid, they paid for with their money to me. If I were in charge their I'd be standing right beside GG yelling, not blaming her. She pays my salary! And if management there still behaves this way even afetr you-know-who left then his release was just to take away the lighning rod and put in another one because the management philosophy of blame the customer is endemic, not the fault of the one guy.