TBH, I've never been fired. I have fired a handful of people. All of them have been fired after more than a week (in some case, much more). I believe that all of them could have been fired earlier, saving both us and them a lot of time and trouble.

I know this is a black-and-white type of argument, and in real life things are obviously more complicated.

Or maybe some of them could have been mentored away from the problems they had? Or maybe someone could have done a better job not hiring them in the first place and not starting a relationship?

I don't agree so much with the implication of "VC meetings aren't job interviews, they're relationships." Jobs are relationships, too. In fact, your employees are often sacrificing more than your investors to be with you. For your investors, it's just money, and they have enough or they wouldn't be risking it in investments. For your employees, it's their livelihood, health insurance (in the US), families, and 8+ hours out of every day--time which is key when in your life, time is really all you ultimately have.

In other words, don't be so non chalant about employees. They're people too.

I couldn't agree more. I would never want to work for someone who is able to fire anyone after only a week for whatever reason (assuming he does good screening of candidates, otherwise the problem is his broken hiring process and I don't want to work for him in that case either).

That's why the screening process is so important, and should not be rushed.