@farmerman,
If you buy the intent of the law, then the increased number of "homicides" may only mean that more people can and have now killed their attackers rather than running from them or submitting.
It's tough, though, to imagine that someone who is being attacked actually thinks about the legality of their response, but I don't know; I've never been attacked.
I also don't know that killing someone who wants to hurt me or my family means I'm not civilized.
My bet is that the number of people killed who didn't deserve a violent end is very small. It seems to me that it comes down to whether you think preventing the rare situation where an innocent person is killed through misguided "self-defense": is more important than preventing the numerous ones where a criminal intentionally hurts or kills innocent persons.
Not an easy conclusion to reach.