The kids probably had no intention of killing the homeowners but what are the homeowners to do when three people wearing masks are approaching with a gun drawn.
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The homeowner only has one chance to guess what they plan to do. It’s not like they knock on the door and say they are only there to steal some stuff and then be on their way.
Bang bang bang. Why did you come to my door with guns drawn and masks on?
The leader shot first and shot multiple times. I would conclude he had every intention of killing the homeowner and his relatives.
There are claims that the homeowner had been previously threatened by these kids. I have not been able to verify the claims. If true, that would explain everything.