I personally blame the certifications. They make it way too easy for someone to become a personal trainer.... I’ve seen people that hardly ever trained before, and basically don’t know shit about exercise/diet, go out and pass tests like ACE (everyone and their grand mothers have this where I live). Don’t get me wrong their are some good trainers that have it, but IMO they took it only because its well known and most gyms accept it first hand. Those who know their shit about training can probably pass it with their eyes close...
NASM, ACSM, ISSA (which I am working on now) are more in-depth when it comes to training and diet...And in my IMO are alot harder to pass than many of the others....