Castle Law / doctrine is not just “shoot, dead, you’re on my property everything is ok”, there’s still a chance you’ll get charged with murder or manslaughter depending on the investigation. And there’s still a LOT of legal stuff you’ll have to go through even if it’s justified.
You're right it does depend on the state and on circumstance, but most states with Castle Law at the bare minimum say that if a person believes their life is in danger, then they can use lethal force - everything from that point is a matter of justifying the danger.
It totally depends on the state. I've known more than a couple of people who have shot intruders breaking into their home, and the furthest it went was the police came and picked up the body or injured person, and seized the gun (temporarily) for analysis.
On the flip side a guy in my state was just convicted of Murder with a life sentence a few weeks ago for shooting someone through his house window. (Chad Copley) He was charged because he supposedly lied multiple times to the police about what exactly happened, and police deemed he had no reason to believe his life was in danger. They argued that he was pissed off and looking to take his rage out on the kids making noise outside his house at midnight.
Whether or not there is further legal action 100% depends on the police judgement.
No one is eager to shoot people under the castle law (I am a concealed carrier in the south) and in fact, 99% of people do NOT want to shoot someone.
While I agree with you that a lot of people don't want to shoot, I def disagree about the 99% statistic. I think that depends on the type of gun owner. What I notice is there's mainly 2 different types of gun owners. There's the stereotypical ones who are highly passionate about their guns, often with at least some mild libertarian anti-government sentiments - the "Guns are my right as an American" attitude. Then there's the true "self defense owners", the ones who aren't necessarily passionate about guns but simply own one truly to protect themselves or their families.
I live in NC, and most of the people I know classify as the former, whom are of the more "gun passionate" variety, and they're frequently joking about wishing someone will break into their house to blow them away.
And it's not like I go to conventions looking to meet these kinds of people or anything. It's just simply most of the gun owners I meet are the types who are quick to joke about the power they wield from owning that gun, and how it empowers them as a person against anyone who seeks to do them ill. These are the sorts of people who don't buy guns because they feel they are in any sort of danger, but because they feel it is their right to own them, and also often simply because they think they're cool. I believe a lot of people in the south would fit under this.