Killing them was not the intent. It was the result of decades of corruption.
Goins and Narcotics Squad 15 had been lying, cutting corners, arresting innocents, overcharging on overtime and pocketing informant money for a long time.
In this case, they did a no-knock raid on an innocent couple, based on a warrant obtained by fraud on the court. Dennis Tuttlet fought back.
They were used to having their way and molesting people without consequence.
A combination of Dennis Tuttle fighting back, Goins being shot in the neck, so he could not talk to coordinate the coverup, and the ubiquity of digital recording devices, brought them down.
Corruption, all over the country, is being reduced by the ubiquity of recording devices and the growing use of body cameras.
One thing that stood out about the raid, was there were no body cameras. The Narcotics Squad was exempt, because they were "undercover" officers. For decades. Goins had been an "undercover" narcotics officer for over 30 years!
In which case, he should never have been involved in a raid.
If you are serving a warrant, ESPECIALLY a "no knock" one, then ALL officers present must be in uniform, and with running camera. And any "failure" of a camera must be considered negatively by the jury.