Since the sponsors of that ad remain anonymous, how do the complainers know that the ad wasn't sponsored by Native Americans themselves?

"Some...residents were offended." I find it offensive that "some" want to protect govt. from accountability by removing the strongest limit on its power: an armed citizen. I fine it offensive that anyone thinks they can "get offended" when reminded of the fatal consequences of trusting govt. to protect. Delusional cowards are an embarrassment to our species.