I wonder if most of those people are also iPhone users - because guess what, their idol Steve Jobs was treating people like that on a daily basis, in order to have them make the iPhones these people have today.
Musk, like all hard-core leaders demand extreme performance out of an employee, because it's the only way to have extremely high quality products and without delays. Whether it's because your wife is having a baby, or you forgot to put the alarm in the morning or got stuck in traffic, those are ultimately just "excuses" to him.
The Internet mob has only one rule: "Guilty until proven innocent".
I suspect that the turmoil has been caused by the upcoming book http://www.amazon.com/Elon-Musk-SpaceX-Fantastic-Future/dp/0... and its dubious marketing strategy: http://uk.businessinsider.com/elon-musk-email-tesla-employee...
As you can see from a recent thread, It's easy to fall into the clichè of drama and hubris https://news.ycombinator.com/item?id=9526362 Some users even imply he may be a sociopath.
We are not quite able to cope with the success of other people. We MUST find some kind of weakness, or tradeoff: this is why media love troubled geniuses. "Sure, Einstein was a great physicist, but did you know that [insert meaningless gossip]". It gives us the illusion of being morally superior, because of the false dichotomy between love/affection/community and money/mastery/fame.