Individuals shot while holding knives are often seen as trying to commit suicide by cop and cops too often oblige. Police are not mental health experts, but they are tasked with public safety. Is killing suicidal, distressed, or disoriented individuals the best they can do? (Not to mention, the mentally ill have more to fear from police than vice versa.)
Compare these stories with two instances of UK police—only about five percent of whom are armed—handling men with knives in an admirably brave (and restrained) fashion: in one, an officer Tasers a man with two knives from just a few feet away, while in the other, 30 cops—the visible ones clearly unarmed—spend nearly six minutes trying to apprehend an aggressively unhinged man holding a machete. If folks with whittling knives, bats, and steak knives are given mere seconds before fatal shots are fired, this guy deserved a millisecond. And yet, the cops brought him in alive—and took him to a mental health facility.