Sorry - wrong thread, but that's at least 8 (maybe more?) groin/hernia injuries in 18 months.
Why don't you, in the correct thread (since Murray has been knee injuries) list them out (along with other you think might be S&C related)? When you do you will probably find that they are either with established players or players that got injured coming off of other injuries. Horton is an example.
Until you do and actually attempt to prove your hypothesis; I'd say keep your accusations to yourself. You are taking unrelated events and trying to draw a correlation back to people that give them offseason workouts as well as some maintenance work during the season. I'm not even sure if these guys have any input on when a player comes back (I doubt they do) or their rehab (once again I doubt it).
I feel like I'm going back to listening to people state that Ken Griffey's injury history toward the end of his career was because he didn't stretch properly.