That is an example of an extreme event. These aren't common occurrences, and law enforcement isn't qualified to handle that. You call in professionals for that. Same as hostage situations. The issue isn't that not having the right guns in that situation was the problem. The problem was not having the right people with the right tools.
Where non lethal force is no longer enough... As a civilian you should no longer be involved. That's time to call in professionals. Those professionals are not average law enforcement.