Prairie Dogs are a pest to ranchers and farmers, not Donald Trump Jr. That's the difference.
They are a part of the prairie's ecosystem, breaking up rock hard ground and their abandoned holes giving shelter to various other critters. They're not bad creatures.
Donald Trump Jr. needs to "blow off steam" shooting little rodents? That's juvenile or sick, one or the other.
If he is helping kill the prairie dogs on a farm or a ranch, who really cares, he is helping take care of pests. I don't hunt nor do I care to but I know those that get permits, issued by states and kill rabbits, prairie dogs, coyotes, bear and on and on, the reason...to control the animal population.