What's really horrifying is how many people seem unaware that the people he shot were under the impression that they were trying to stop an active shooter. You know, do that good-guy-with-a-gun thing, while acting on initially (but not eventually) incorrect information.
It's quite likely that if he were the one gunned down, and not the other way around, the people who did so would have walked, too.
It's quite likely that if he were the one gunned down, and not the other way around, the people who did so would have walked, too.