...and yet Dick's Sporting Goods now makes themselves a "part of the story", with their CEO going on national TV interviews (including this morning on ABC's Good Morning America) to promote his brand, and one, supposes, their moral superiority.
One can make the case that (as Dick's CEO did) that it is risky to sell firearms under the current environment, which suffers from insufficient background checks for criminal histories and mental illness, and other failures of law enforcement. But why then sell guns at all, as opposed to not selling only semi-automatic rifles? More crazy people kill others with pistols than with rifles, after all.
But the entire problem here is that such violence is in fact, rare in the United States, in spite of highly-publicized events such as those in Sandy Hook, Las Vegas, and now in Florida. Most firearms deaths in the US are the result of suicide (pistols, again). There is no good reason though, to refuse to sell semi-autos to responsible citizens, who in any event can buy the same weapons at dozens of other sporting goods and firearms outlets.