different children require different parenting styles. I don't think all children need to be spanked, however, I do think that some children do require a firm swat on the bottom on ocassion. Some children do not respond well to calm, cool and collected rational tone of voice--sometimes you have to raise your voice to get a child's attention.
That said: please keep in mind that Jon and Kate were at one time "ordinary" parents who were not being scrutinized and 'watched'. And what the public sees now may or may not be an accurate reflection of Jon and Kate. I don't know them, thus I don't know if either of them are "bad" parents.

And FWIW; just because a parent hasn't lost their cool w/ a very young child is not necessarily indicative of what the future may hold. Count your blessings that you have been able to maintain your cool, or that your child hasn't pushed your upper-most limits of patience! Or that you have great support network which enables you to have "down time" or that provides 'help'....really, never say never! It will most likely come back to bite you in the arse.

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Mental that one, I'm telling you. ---Ron Weasley, "Harry Potter and the Chamber of Secrets"