I am not to the point of calling this murder because I do not think that most officers set up to deliberately kill someone.
I would say that the training they are now receiving has swung way to far in to "guilty until proven innocent" instead of what it always was, "innocent until proven guilty".
Officers are also being taught, with range commands such as "gun" instead of "fire" that any sight of a gun is reason to shoot. This must be stopped.
They are also being taught that their lives are more important than any suspects which is much easier to swallow with the previous training of "guilty until proven innocent". We have all heard them say that they just want to go home at night.
It is my opinion that all of these aggressive tactics are CAUSING more incidents and officer deaths as suspects now know that they have nothing to lose.
In the old days, a suspect could come out with his hands up, get cuffed, and make it to jail alive. Nowadays, they are rousted from sleep and shot before they can determine if the home invaders are the police or one of their fellow criminals coming to get them.
This leads to many problems as the police are notorious for getting the address wrong and busting in to the wrong house, shooting the law-abiding that thinks the police are criminals.
Just like this unlucky Marine, I have no reason to think that the police would bust down my door and come in with guns ablaze. I would be grabbing my gun at the first sound of door breaking. I would probably get shot.
If the police are so afraid to serve a warrant, they could easily take down the suspect when he leaves to go to work or leaves to get a loaf of bread. They can surround the house and demand everyone come out. If they refuse, they can escalate the situation.
If they are so afraid of evidence being destroyed then they are being lazy and have not built their case up good enough. It is much easier to bust in and find evidence than spend time compiling evidence. I do not think they should be able to get a warrant unless they already have enough evidence to arrest the suspect. They are able to get these no-knock warrants too easy.
They have forgotten that they are supposed to "Serve and Protect".