Announcing yourself is tactically a bad decision, but it might be what lets you sleep at night afterwards. I'm not going to kill anyone over a TV. I'll give someone every chance to run away - it's only when they move towards me or mine that causes me enough concern to be willing to kill them.
I acknowledge that this places me in greater danger. It's obviously a decision everyone has to make on their own according to what they can do and live with afterwards.