1. They should have known a legal gun owner was present. What would anyone expect a gun-owner to do when their home is broken into? Hasn't Charlton Heston said something about all this?
2. They should have been trained and prepared to execute their warrant under these conditions with a plan for mitigating loss of life, especially since the suspects in the crime were already arrested, and none were thought to be present at the address. None of the people at the address were suspected of criminal activity, and no drugs, or criminal paraphernalia were found. The stakes of the raid were not justified in my opinion - but I of course, do not have all the facts, but I feel like I have enough to make these statements.
I absolutely will not accept "who shot first" that's absurd.
To
Breonna's boyfriend fearing for his safety fired several shots at the plain-clothed men who had just broken into his home. These police officers returned fired, striking Breonna at least eight times.
When most people read "Kenneth got into a brief confrontation with John. John then fired four rounds at Kenneth." they will assume brief confrontation means "shouting and cursing match" or "physical altercation" not "fired a gun at".
Your home, your legally owned gun, your panic and chaos, you shoot. I would do the same, I would not be surprised that others did the same.
Expectation of professionalism, and de-escalation is on the regulated authority with power and accountability. If they were well trained, and made a calculated risk for an important case, they may be justified. From all that I can find, it seems clear to me that the police acted unprofessionally, and anything past that is not really a factor until that unprofessional behavior is addressed.
I also understood it that it is not the fact the police responded in kind that is criticised, instead they question the viability of these no-knock raids in general.
Maybe the order could have been better, but I don't see a real problem here.
If the police had not been there at all, or had been issued a standard warrant, the the "who shot first" issue is not a question that needs to be asked.