It isn't really the shooting range that makes it trashy, it's the fact that it's only 25 minutes away and a straight shot off of the highway so it draws lots of crowds of people who are looking for something with easy access. It's been trashy for decades, and I would wager a lot of those people don't even know it extends to the west and has a shooting range. If you want something less sketchy and close I'd recommend Sac Woods or Pleasant Hope up 13, or Compton Hollow out east by Northview. They're smaller but they're closer and less crowded and way less chewed up. In fact I can say from personal experience that PH has never had any issues with nazis or otherwise unsavory types and until a couple of years ago they also had an unsupervised shooting range.

Also fyi the Frisco is only paved up to Willard and in Bolivar, so if you drive another 8 miles or so down 160 from the Kearney trailhead it's unpaved for the next 20+ miles.