Then you haven't met enough of these people.
One of my best hiring choices (whom I pushed hard for, against the objections of others, based on a solid interview result) pushes a new company-changing product every couple of weeks or so, it seems.
One of my less wise choices (despite being good employee in certain ways), is currently responsible for my inbox filling up with emails from HR and legal.
And if you can't make friends with the people who you spend 8 hours of the day with, who can you be friends with?
Most jobs involve working with others. Due to the nature of 'work', it's not always easy. The ability to work together towards a shared goal even in the presence of pressures that would challenge interpersonal harmony is an important skill.
This narrative is pushed constantly, to the point where it's started to lose believability with me. It's used by large companies to justify their BS hiring practices when the reality is a bad hire won't hurt the company that much. It's used by small companies to justify nonsensical interview practices.
> Human questions. Does this question give the candidate a chance to display a wide enough range of himself, socially, that you are comfortable that he can work well with other people?
I try not to display much of myself socially when I'm at work. I'm there to work. I'll gladly go out for lunch and be friendly with coworkers, but it's not hanging out with friends. It never will be.