Well, IMHO, GreenDragon. your point doesn’t hold; it’s like saying you’re not sure if going to the gym makes one physically fit, because you can do it by being a robber too and running for your life each night 
I’ve read of people who would naturally induce LD’s just by changing diet, here’s one notable example. Meditation, positive thinking, physical and mental fitness are all good ways to improve your LD frequency, and are also very enjoyable and positive by themselves 