This is a straw man argument. I never asked anyone to endanger themselves. I don't criticize the officers who shot the man--it was a tough call and while it turns out they made the wrong call, I believe they made the best call they could given the information they had. I'm saying that the officer who didn't shoot, should be lauded for his actions, not fired.
Further, people who apply for police work do so of their own accord. No one forces anyone to become a police officer. If you want to be safe, you should get a desk job instead of becoming a police officer. If you put yourself in danger and use that as an excuse to shoot people unequivocally, you're just a murderer. Part of an officer's job is assessing a situation and deciding whether lethal force is warranted. I don't blame an officer for making the decision to use lethal force, but it should be a decision. And if you aren't willing to make that decision, you should find another career.