I think some people need to remember that it isn't specifically what a person does for a living that makes them relevant emotionally to a stranger. This individual had a bearing on the lives of many people he never met, and some of those people will be thankful to him for that, regardless of if he was the janitor or CEO. I was a bit upset when James Gandolfini died, because I could relate to one of his characters, not because he was a mafia boss, but because he was a fundamentally flawed person, as are we all, and it's rare to see that portrayed so well. So even though I never met the man, and he was likely very different from his portrayals, his death was of note to me. I doubt this is different at all for those getting upset, even from afar people can alter our perspectives, lives and livings. Those saying 'lol just a CEO' should perhaps keep this in mind.
So while this is little more than a bit sad for me, I can totally understand those who feel a greater loss, even though he was essentially a stranger.