I also don't understand why so many men (and women, but mostly men) in high positions jeopardise everything like this.
I mean, it's really not difficult to not end up in these sort of situations. If you were high profile, especially in politics where no matter what there will always be people in the media against you (even if it's just politically), then why on earth would you think you could get away with something like this and it wouldn't end up front page news?
Is it arrogance?