What is the deal with people in sports latching onto any statistic they can conjure up and then treating it as a decision making tool?

Examples: 

1. No coach has ever won a Superbowl with one team and then come back and won it with another.
   So what?  How big of a sample size is there?  Isn't it like 12?  There is only one Superbowl ever year.  Think about it. 
2. QBs in the first round aren't always great.  Tom Brady wasn't first round.
   No shit? You mean you can get a good QB in the first round, or in the 4th?  C'mon, this is really suprising to football fans?

I guess what I am getting at is, would some people seriously even consider things like this when choosing a coach or a quarterback?  I certainly hope not.  How about simply considering the person, their abilities, and how they would fit with the planned Superbowl-winning team of 2012?  (That's right, Superbowl 2012!!)