Breonna Taylor was heavily in the drug business with her ex boyfriend - that is the reason they had the warrant for her address. Her boyfriend started shooting at the cops and they shot back. It's a very unfortunate incident - but hardly the case of the cops looking to go out and shoot somebody.
Tasing someone is not killing someone. If they were wrongly tased they should sue the crap out of the police department.
Countless? - if they are so countless how come you have 1 incident you can name. 14 unarmed black people were killed last year and at least 8 of them were resisting arrest. 12 people died from lightning last year by the way.
As far as cops not having the right to be an executioner - you are dead wrong - if their life is threatened they have every right to protect themselves with deadly force - just like every citizen does.
I'm taking this from 2 stories Google found in 10 seconds.
Walker fired first because the 3 officers who came in had a no knock warrant, which literally means they entered the house without identifying themselves. Walker has a permit for his gun and in the state of Kentucky you are allowed to use deadly force to protect yourself, and your property(which I question). Walker has stated repeatedly they did not immediately identify themselves as police officers, it was night, he thought people were breaking in so he grabbed his gun and shot to defend himself and Breonna.
The suspects they were looking for were her ex boyfriend, and his friend, also last name Walker. The ex boyfriend had used her mailing address several times, not clear if she knew or not.
The police had no idea if the actual suspect was in the house, in fact if you look up no knock warrant it literally says the police are allowed to enter a house without knocking or identifying themselves in advance because to do so would jeopardize their case. The normal use would be a situation where if the suspect knows the police are outside they can destroy evidence, drugs etc, and or it may put the police in danger if they identify themselves first. In this case the suspect was NOT there and it appears they made no effort to ensure he was there. He had apparently used her car in the past so the police claimed they saw the car outside and assumed he was there, it was her car. One of the conditions of such a warrant is you are supposed to be close to certain that what you think is in the house is in fact there. You can't use a no knock warrant as a fishing expedition, right after this case Louisville banned no knock warrants for that very reason, too often police were using them without meeting the standard for certainty they had the right place, the person was there etc
Taylor had no criminal record, she did have a drug dealing ex boyfriend but she herself had no record, and there were no drugs found in the house. The police said they got the warrant because they suspected she was receiving packages of drugs on his behalf, and because drug dealers have cameras that allow them to see police coming in advance and destroy the evidence. There were no such cameras in the house, and the Postal Inspector for Louisville, Tony Gooden, said they'd already investigated that allegation and informed the police there was no evidence she was receiving such packages. That happened 2 months before the police got the warrant to enter her house. Attorneys for the family contend the police lied in the documentation they gave to the judge in order to get the Warrant. THe police also insist they knocked repeatedly( Walker says he heard banging as they came in) and they identified themselves as police, Walker insists they did not. Again literally the purpose of the warrant in their own words was so they could enter the house WITHOUT identifying themselves so there was less time to destroy evidence, now they're claiming they repeatedly identified themselves. Walker thought it was a home invasion.
Walker fired a low warning shot that apparently went through a door or wall and hit one of the cops in the leg. The cops then fired back, broke down the door with a battering ram and fired at least 20 shots, 8 of which hit Taylor who was asleep in bed when it started.
As is so often the case in these situations rather than try to find out what went wrong so they can train their officers to avoid it again, the police are spending their time trying to figure out a plausible defense for why Breonna Taylor is dead.