Isn't the bad hire/good hire feeling that is described here much to personal? If the so called bad hire somehow senses the hostility, no wonder why he leaves the company.

If you inadvertently cross a few red lines as a new hire you can ring a few alarms in your hirer's mind. If those red lines are in the company culture that's fine, you might be a bad hire (or the company culture might suck, which should have the same consequences). But sometimes those red lines are totally hirer specific.