Cubfan, You're saying that tracks are using poly as an excuse for injuries and that it is, therefore being unfairly blamed. That may be true but I think what you’re more likely trying to say is that the tracks are using injuries as an excuse for installing poly rather than dealing with drug issues – which is just the opposite.
In that case, I seriously doubt that track management will magically start cracking down on drug use if they didn’t install synthetic surfaces. I also doubt that trainers will suddenly start breeding for sounder horses. Drugs, breeding and surfaces are all factors in injuries. The ways of dealing with them are not mutually exclusive - the more steps taken the better.
Personally, I don’t care a fig what the track’s motivation is for installing a safer surface, as long as they do.

Bob