In his career, he would in all likelihood have only been faced with a theoretical situation - it is very easy to say I would do this and that in that situation. None of us knows - even in a job as his or even the Army (there have been many who have crumbled under fire), how we would act in a real situation. I cant blame him for not putting his life on the line, but definitely he should now stand down as he cannot now ask others to do what he has found in himself that he cannot do.
And that is probably the best, most reasoned post in the discussion. Whether you think he should or shouldn't have put his life on the line, it's in the past now, I don't think he can now ask others to, when he chose not to.