Okay, I'll be the grouch
It's a funny story. If it's
not true, it's a really funny story.
But if it
is true, what were the calls that those cops got pulled off of? Maybe just commercial burglaries, but there are a lot of violent crimes that would be lower priority than a multiple shooting. Domestic violence, for one. Rape, for another. Just about any violence where "only" one life - or none - is in danger. Never mind the fire trucks and the ambulance might have had better places to go, too.
It would be nice if police could always respond immediately to a property crime in progress. But if this story is true, the guy endangered other people to protect his property. Let's hope it's just a funny story.
ETA:
Snopes analysis of the story - which sometimes isn't any more trustworthy than the rumors they purport to investigate, but anyhow there it is.