Depends on the cause of the injury, but I'd imagine for most injury prone players it's not bad luck, it's that their bodies just can't cope with the physical stress of playing top level professional football.
Sure, clubs can try and manage minutes, and I'm sure there are lots of techniques to try and improve things, but there must be only so far that can go. When players like Bruno and Salah play just about every game while you see what's happened to guys like Shaw and Mount, it must just be the limitations of some people's bodies in my opinion.
Yes, I suppose you are right, but can't helping thinking there must be something else.
I remember Gary Neville once saying most players, at one time or another, carried 'knocks' but still went out and put in a shift. Maybe for some players its the limitations of their outlook/temperament, if they are told they need respite, down-time, etc. it sinks in!
Surely with all the modern medical/sporting technology that is available, when clubs do their fitness tests on players, they are able to spot the existence of bone/muscle weaknesses, susceptibility to strains, etc?
You sometime get the impression fitness training regimes that players are exposed to means they are being treated more like pedigree racehorses, and being prepared solely for speed and stamina and not the hustles and body jarring impacts that happens in any contact sport.
It's a puzzlement for sure that some players can ride out the contact occasions and the stretching and straining issues and others, once injured, never fully recover; just enough maybe to have presence on the pitch, but unable to reach the former performance levels.... go figure!!