I find this a very naive view point. Hiring is exceedingly difficult, and the reality is that no matter how well intentioned your process you never know whether

I find this a very naive view point. Hiring is exceedingly difficult, and the reality is that no matter how well intentioned your process you never know whether the person you've hired fits with your organization, or isn't an outright liar. If you hire people, you will fire people (or be stuck with people who for whatever reason don't work well).