It was all good stuff, and it sounded like everybody was on the same page. And then the aura of polite togetherness was punctured when Kamau Bobb, who works on diversity strategy for Google and is the founder of the Constellations Center for Equity in Computing at Georgia Tech, delivered a smoldering keynote address that focused not so much on feel-good tech outreach programs but on the state of black folks in Atlanta, a majority-black city where black people are assumed to be thriving. They’re not.