You don't have to distrust the single stat, but you have to at least take it with a grain of salt. Sometimes a stat like RPM is telling you something real that other stats, that measure things differently, aren't telling you. That was the point of the famous Shane Batter "no-stats All Star" article that (in the mainstream basketball consciousness) kicked off the awareness of "Moneyball"-like advanced numbers that capture things not recorded as points, assists, rebounds, blocks or steals (or even scoring efficiency).
Of course, sometimes the single stat is just giving you a nonsense result. You do always have to keep both possibilities in mind.