they probably were going out to steal catalytic converters,etc....don't think they needed to be shot down because of it but if caught in the act, what is one supposed to do..
....the killer must have cornered them to be able to dispatch them all.....unless he had help...
an no one heard gunshots?....
Yes that makes a lot of sense! Smart thinking. They tried to rob catalytic converters from the junkman. Never mess with the junkman.