After his initial post, Barker continued researching and compiling information, which further confirmed his initial hypothesis. He found that, on average, 14.29 people die in mass shootings that are halted by law enforcement intervention, while only 2.33 people die when courageous citizens deter the attacker.
Barker concluded his post with this statement:
Given that far less people die in rampage shootings stopped by a proactive civilian, only civilians have any opportunity to stop rampage shootings in roughly half of incidents, and armed civilians do better on average than unarmed civilians, wouldn’t you want those heroic individuals who risk their lives to save others to have every tool available at their disposal? [ref]