Yes. You’d have to be more blood-thirsty than afraid to do what he did.
THAT’S the term I was looking for.
When he left, he could have called the police.
This seems more like he WANTED to shoot something dead, and thought he had a great excuse (intruder in his home) to do it.
The charge is appropriate. If that is the story the jury hears I expect they find him guilty.