Life is a Bell curve

As I am about to come up on my first full year without school I began to notice a lot in the world. The biggest thing I have notice is that the bell curve still applies to just about everything. The one topic in particular is the abilities of trainers. I have had the chance to visit and talk to many trainers from different walks of life. Each bring something unique to the table. But i still notice that even in the same facility trainers will still stay true to the bell curve. I find that trainers that share the same certifications will have completely different skill levels when dealing with clients. I see one trainer who walks his clients from machine to machine and basically becomes a human rep counter. The other will take a similar client and teach them how to use free weights. I can’t say which is wrong or right because sometimes you won’t be able to do a lot of exercises due to limitations(personally lean towards teaching clients how to move properly). How can a professional who have the same certifications perform exercises that are detrimental to their client. I guess I haven’t been in the business long enough to understand why those trainer decide that it’s important to take their clients money like that. I guess it shocks me because I expect better from professionals in this field but I guess people will always fall under the bell curve.