You shouldn't, because its brainless nonsense. Unless these were the first black people this officer ever saw while on duty, those "explanations" are idiotic and clearly false. Why didn't he shoot every black person at the party? Why didn't he shoot every black person he saw on the way to the party? Why didn't he shoot all his fellow officers that are black?
That was not Loren's assertion. The assertion is that a police officer would not shoot a person for no reason. A list of people shot by police for no reason is, necessarily, a refutation of this assertion.
I mean, I guess you could remove a couple of them if you count "reached for his ID after I asked him to present ID" as a "reason" to shoot someone. But in that case, we're arguing something asinine - and you're still left with people like Sean Bell, who was shot while lying on his stomach with his hands cuffed behind his back.
And this doesn't count people like Freddie Grey, who was "mysteriously" injured while in the back of a police car, the people who somehow shot themselves in the face while their hands were cuffed behind their backs, the videos of police simply running up and punching and/or kicking people in the head, and so forth. Nor does it count people like Aiyana Stanley-Jones, who was set on fire and shot in the face because a SWAT team raided her home - which was the wrong home. And the various teenaged girls that some police seem to enjoy body slamming. And it just goes on and on and on...
But in any case, try to pay attention to the conversation next time, before you ironically claim that someone else's argument is "idiotic and clearly false".