I'm not going to defend these actions, but I can see how the culture in baseball front offices can lead to an environment where this is possible. Men in their 20's and 30's working 80-100 hours per week and unable to go out and socialize are probably going to creep on the only women they come across.
Again, not an excuse, but if you wanted to "five why" this, the workplace culture is probably a root cause of why this happens so often.