I don't understand how you can not be concerned of him being injury prone
Being concerned and saying...
MURRAY HURT AGAIN WHAT A SUPRISE
I say it time and time again he is made of glass
...are two entirely different things. Yes, I have concern, but I am also not 'concerned' or worried, nor do I believe Murray is 'made of glass'. Why not? Small sample size. He's had two relatively major injuries. He's recovered from one of these already, played quite well afterward, in fact.
He's still recovering from the second. I don't know what 'setback' means with Richards, and I suppose it means it's showing some swelling and tenderness. I wouldn't call it a new injury, and therefore, I won't panic. His recovery from the knee injury and surgery has been slow, but not all knee surgeries are alike, so it's pretty difficult to judge whether it is a 'slow' recovery or not based on what little we actually know about it.
The 'glass' comments are premature, IMO. He's had some bad luck having two relatively major injuries so close together at the beginning of his career, but categorizing him with Klesla, Modin etc is just kind of a silly overreaction.