(Assuming that his behavior was necessary to the quality of the product (an assumption neither Steve nor his biographer were willing to make)):

He didn't "kill" them. He hurt their feelings.

Weigh a few bruised egos versus hundreds of millions of people with delightful, time-saving devices. As the book points out, yes, there is a real and measurable cost to wasting people's time with a badly designed device. And there is a benefit to delighting people.

I see a lot of people fixated on the, let's face it, pretty mundane human costs, unable to see what he actually accomplished. I don't want these people to be leaders, and in my opinion we are in a worse position when these people become leaders. They harm the rest of us because they cannot overcome their fixation on a few pitiable people to see the larger picture.