Some of entrepreneurship's biggest successful outliers seem to have exhibited those traits and thus they became part of silicon valley lore. I think it's important for people getting into startups to understand that you don't have to turn yourself into a stone cold shark. Some business decisions will be tough, but that doesn't mean you have to be an ass about them. Your ambition can be to be successful, but that doesn't mean you have to "crush your competitors" or disregard other people entirely.
An article I once read cited a study showing that on average, people are more financially successful AND happy, if they are considered by their friends to be good people. I tried to find it just now but couldn't. Has anybody heard of similar results?
Edit: What are some examples of extremely successful entrepreneurs that were known to be extremely kind?