There is an example to support almost every defensive viewpoint.
Locally, we had a LEO killed when her high-capacity 9mm malfunctioned/jammed after just a one or two rounds during the response to a domestic violence call. She was unable to get the weapon functioning again, had no BUG, and ended up being executed while attempting to hide under a vehicle.
Does this mean high capacity 9mms are not appropriate for service? In her case, it wasn't even a "one bad guy gun".
Would there have been a better outcome is she had been armed with a S&W .38 wheelgun? Maybe so.
I am not arguing the above, just pointing out that using one example of an event to justify choices of carry equipment can be problematic.