In other words: don't be an idiot and call the cops instead. That's what they are supposed to be for!
Just a year later during the mall shooting in Allen Texas, cops took down the white supremacist, neo-nazi perpetrator in under 5 minutes, probably saving at least a co couple dozen lives (he’d already killed 9). You can watch the bodycam footage from that event if there’s any doubt
"Here's another outlier anecdote!"
No. There is sufficient evidence supporting cowardice.