i will says that all this things can be happened with all religions as they are human, even tho they have vows and commitment to do. It just of the matter we come across the news or not.
How many people that engage into the practice with pure motivation and develop the mind to be strong and firm and go all the way in the spiritual path which they should, with now a days there are so many things that shaking the feeling and their mind and it create more delusion instead of control it.
i look at the norm otherwise Buddha will not create vows and precepts for monk to follow and if the state of mind and the practice of all monks are same level then all will gain enlightenment. It does not happen this way in the past and especial in the present and in the future which is the degenerate time.