Why it's dangerous to reprimand a dog for growling

When a dog growls, the temptation is to reprimand it. This is a really bad idea. Some links below discuss why:

http://www.dogstardaily.com/training/fearful-growling
http://www.whole-dog-journal.com/issues/12_10/features/Training-For-Growling-Behavior_16163-1.html
http://www.greenacreskennel.com/dog-behavior-and-training/growling-what-should-i-do-when-my-dog-growls