Everything that happens is a conspiracy.
Everything. There is no reality, only conspiracy. If you don’t agree, you are part of the conspiracy of everything.
Your conspiracy description is sadly accurate.
There is about 90 minutes of the dispatch tape available online (think it was linked on Heavy.Com) and people can listen for themselves.
It was predictably chaotic. Your mileage may vary, but from the radio traffic it sounds like the guy was very focused on shooting at the officers after they arrived and not wandering the store killing more people.