The Constitutional mandated,"Innocent until proven guilty to the exclusion of reasonable doubt", no longer applies. Hell, the Constitution itself no longer applies.Everyone except the Governmental Agents is guilty of some crime. And the Governmental Agents are going to ferret it out. Don't believe that? Look no further than today's FBI.
Which means you should believe the police account of what happened and that they shot in self-defense unless there is proof they aren't telling the truth.
A judge granted the police a warrant. They had ever legal right to enter the couple's home. No one would have been harmed if the police hadn't been ambushed.