Not at all. They could have used a bull horn or the store intercom to tell him to put the gun down and no one would have been hurt.
That was the first thought that occurred to me, as well. But, like you say, in the vast majority of cases there are no consequences for wrongful death by cop, so what motivation is there for cops to think of non-lethal approaches? None. To them, due to the modern police culture, civilian life is cheap.
