The overall issues seem to be these:
- Separate issue is whether Breonna Taylor was involved in drug dealing and drugs generally.
- Ethics of no knock warrants
- Did police announce themselves when they got to the house
- Who shot first
- Was it reasonable for police to defend themselves with lethal force when they entered
- How many shots was reasonable for the police to discharge in response to a lethal threat
The first and most obvious point is that a Grand Jury of ordinary citizens who had all the evidence presented to them did not find that murder or manslaughter charges should be made against the police officers. The grand jury were presented with all of the evidence of the case (which we as outsiders have not yet seen). So it would seem reasonable to place a great deal of weight on the Grand Jury decision. It would appear the evidence does not support the many allegations against the 3 cops.
Was Breonna Taylor involved in drugs:? There is a leaked police report which shows that Breonna Taylor received 26 phone calls in 2 days from Jamarcus Glover (a prison inmate and her ex boyfriend). Jamarcus was arrested the same morning Breonna was shot and he was found with cocaine, marijuana, assorted pills and cash. There seems to have been reasonable suspicion that Breonna was also involved in the drug trafficking as well This is not to say that she was trafficking drugs, but there appears to be reasonable suspicion based on the police surveillance.
No knock warrants: IMO no knock warrants seem a risky warrant to use. If you turn up to someones house and kick down the door without announcing yourself, you're likely just going to have them shoot you.
Did police announce: There is conflicting evidence whether the police did or didn't announce themselves when they got to the house. There is evidence supporting their claims, and also other evidence which contradicts it.
Who shot first: It was confirmed that Walker shot first (Walker admitted to it).
Reasonable for police to defend themselves?: IMO it would seem reasonable that if someone shoots at a police officer(s), the police officers involved are going to shoot back at the target to defend their lives
How many shots was reasonable for the police to discharge?: I haven't seen any diagrams of the apartment, but given it was dark, the police would seem within their rights to shoot until they believed the target was either incapacitated or the threat had ceased. It seems like Breonna was accidentally caught in the cross fire.