“No knock warrants should be reserved for the most violent and dangerous of offenders, even then there are better ways of doing things.”
How about never? The judicial system has proven over and over that it can’t be trusted with that kind of power.
I would say a no-knock raid should only be used for immediate life-saving measures. Somebody is going to die right this very moment if we don't kick the door in to stop it.
Nothing else.