Self-defense: right or wrong?

I have to say, fellow blogger Spencer has posted what I consider to be a very pertinent Christian view on the ethics of self-defense. Myself, I am in total agreement with it, but I wouldn't mind knowing what you all think about the issue.

http://drpaleophd.blogspot.com/2009/10/warskyl-self-defense-and-holiness.html

Thanks again, Spencer, for yet another thought-provoking blog post!