Maybe a parking lot attendant would be a bit more reactive, but anyone who thinks that leaving a bike in a very public area deters theft should watch this video. A few years old at this point, but they set up their own bikes to steal in very public places in London, and no one bats an eye.

The public at large is quite happy to stick out of other people's business and walk by, even when something obvious is going on. If you want to take it a step further, even if I am well intentioned, put on a hard hat and a hi-viz vest, and I'm likely to completely ignore a guy with a grinder cutting locks.