"From my experience: 
Families that do not punish children in the form of a spank or two: Kids end up losers, disrupters, the type you see in the grocery store where they're telling their parents to shove it... 
Families that do: 
Kids end up very polite, thoughtful, and caring. 
That's all I need to know(My own experience). I'm no doctor, but common sense tells"
Bull.  "Common sense" is nothing but a lable for reasoning that one doesn't understand.  Nice try on the false humility though to try and lend validity to your arguement. 

"Fallacy: Biased Sample 
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Also Known as: Biased Statistics, Loaded Sample, Prejudiced Statistics, Prejudiced Sample, Loaded Statistics, Biased Induction, Biased Generalization 
Description of Biased Sample
This fallacy is committed when a person draws a conclusion about a population based on a sample that is biased or prejudiced in some manner. It has the following form: 
Sample S, which is biased, is taken from population P. 
Conclusion C is drawn about Population P based on S. 
The person committing the fallacy is misusing the following type of reasoning, which is known variously as Inductive Generalization, Generalization, and Statistical Generalization: 
X% of all observed A's are B''s. 
Therefore X% of all A's are Bs. "
http://www.nizkor.org/features/fallacies/biased-sample.html