A business isn't in the business of law enforcement. They're just covering themselves Apples/Oranges here.
"Might", in the world of litigation we live in today, especially with the erroneous notion that city coffers are endless, the 1st time a video shows that some thug had pulled out an illegal assault rifle, and shot up a business district, every family member that had someone shot or killed, where the video may have identified, possibly (not saying it would, only "might" have) stopped a such an action, that city/county will be sued until the tax payers pockets become dry
I'm not arguing that there shouldn't be video, only trying to maximize the usefulness at the least amount of cost to the tax payer. I like the notion that a video automatically starts upon an officer's call on his radio, that he sees or is about to stop someone