Ultimately they are responsible. Really hard to say how much they could have helped, perhaps nobody could have saved Vlad, but there should be complex and modern high performance, development, fitness, game preparation systems in place so when you sit and watch players like Springer, Bo, Vlad, and Kirk all erode physically while displaying horrible approaches and game plans at the plate... it's hard to just say it's all bad luck.
There is also the mental scouting side of things. If Kirk and Vlad are uncoachable weirdos, for some reason, it's on the executives to determine that and act accordingly.