Here is an article
from the American Bar Association Journal that addresses some of the issues this thread is discussing.
In particular the article discusses the ramifications of the "militarization" of police forces, and their accountability (or lack thereof).
Personally, I'm actually as concerned or more about a police raid stemming from bad information as I am about some random burglar breaking in. More, because if I shoot in the former case the likelihood of my survival is almost nil, but I'm actually optimistic about my chances with the burglar.