[Yo-Yo]

"We also know that while having a gun in the hands of a citizen may not stop most murderers, it can sometimes mitigate the damage they inflict."

What part of this sentence do you disagree with? "Mitigate" means to "make less severe, serious, or painful."

I find no fault in the sentence. Armed citizens may not stop most murders, but they can mitigate (lessen) the damage they inflict. The Texas church shooting is a prime example. Armed citizens couldn't stop the gunman from taking two lives, but most likely prevented the loss of several more lives.

[Windflier]

Armed citizens may not stop most murders...

That is the part I disagree with. The author states that as a fact, when it's merely his opinion.

It's the "we" in his statement that creates a sweeping generality that just is not true.