I am not going to say you are wrong because I honestly don't know, I have been laid off for 7 years. That being said when I worked for American Airlines I saw very few career Fleet Service people (20+ years) who had worked the line and not had a major operation (neck, shoulder, back, hip, knee) due to wear and tear from the job. It was so common it was to be expected.
Now having stated that, just how damn hard do you want people to work? Till they liquefy?
I have to ask, do you actually work the ramp in any capacity or do you just sit in an office and soak up air conditioning? Because you sound like a fat, worthless, slob of a crew chief that criticizes ramp workers but has not touched a bag in 20 years. Not saying that is so but I have met many people like that in my career and they all sound....... just like you.