Today's Austin, TX newspaper stated that a drug buy had been made earlier at the house from an unidentified male. So far, so good.
But then it stated that plainclothes officers broke the door down, which prompted the shooting. They allegedly had a warrant.
If this was in fact the case, note that officers in plain clothes are, by definition, NOT readily identifiable as police. Persons, not readily identifiable as police, are, IMHO legitimate targets for any homeowner who's experiencing a break in.
Period.