It's getting to the point where the only way these SWAT teams will take a moment of pause before serving a no-knock warrant is if, upon their invasion into a family's home without warning, some family members in another room than the one being broken into take up arms in response to hearing shots being fired around their loved ones. It would take these family members killing several SWAT members to make these jack-booted thugs rethink their "tactic."
Unless they fear for their lives in executing no-knock raids, these will continue indefinitely.