There's the usual case, and then there is the worst case. Going back to revolvers would work for most cases, but every so often it would just be idiotic.
One can say that about most things. For example, autoloaders work for most cases, but every so often when they jam up it is just idiotic. Police having guns works for most cases, but every so often an officer gets killed with his own gun which is just idiotic. There are many different "worst cases" to consider.