Donald Trump Jr. has found yet another way to monetize his father's presidency — and this could have deadly consequences, a new analysis warns.Salon columnist Heather Digby Parton on Thursday authored a withering editorial about the eldest Trump son's spokesman position at online retailer GrabAGun and his ownership of 300,000 in the publicly traded company. "It’s pretty clear this is just another Trump family grift, and that it will likely have …