Defend or purchase? To answer your question directly, not at all, just that some training is better than none IMHO and that's just me. I took a full day class before even considering purchasing my first handgun. Here in Commifornia, you have to take a simple little 35 question test based on a DOJ pamphlet before purchasing a handgun. It's all common sense safety, etc. but personally I'd like to know that the purchaser knows at least the basics of gun safety and handling and the simplest of laws., not that it applies to criminals. If training is a bone to throw to the 2A haters, so be it. We require 30 hours of class and behind the wheel training before you can get your drivers license here...and people driving cars kill more people than people with guns!