This isn’t an error. It’s people claiming to have done a thing they did not do and demanding to be added to the count.
You're allowed to read the article, you know. They literally cite with corroborated news articles every single claimed omission, they didn't compile this from Google form submissions. They're not "I had a knife pulled on me in an alley" stories, they're instances of live fire into crowds that the FBI is drastically undercounting due to reliance on either local law enforcement reporting incidents or national news media reporting on them. I don't think these are the numbers you'd get with omniscience, real story here to me is that the FBI undercounts so drastically (and potentially with such bias) that you can cite enough new instances to swing their results by an order of magnitude.
"You must defend from your assailants with an attack of equal or lesser hit points or it doesn't count." Am I allowed to pepper spray someone punching me? Or do I need to know what they bench first? Where do knives rank on the chart? And how does this system scale with multiple assailants?
"You prevented nothing, sir"