I can see the argument how you would treat a suspect with a gun differently than you would if they have a knife.
However, American cops also use guns against suspects with knives or other weapons that they also use in places like Scotland. Why couldn’t American police use these techniques when the suspect doesn’t have a gun?
I know the standard response is, “well, they COULD have a gun!”, but I don’t think that is a good enough reason to always go straight to extreme response. If a suspect is brandishing a knife, he probably doesn’t also have a gun.
... how do you know if they have a gun?
As a fun example I had a coworker who collected handguns. I once asked him how many he had and he asked for clarification, should he include unregistered?
Personally I’ve had encounters with LE and have not had a gun drawn yet, so it’s obviously not the default. But I disagree, I think brandishing a knife is already extreme behavior, I don’t think it’s logical to think “because he has a weapon he probably doesn’t have another!”. And why would someone threatening people with a knife deserve benefit of the doubt?
Historically speaking, there were a few shoot-outs in the 80s and 90s. The Hollywood shooting and I think one historically bad incident with cocaine traffickers in Miami - bad days for the police showing up with .38 revolvers and a shotgun or two fighting against a dedicated enemy with AK style weapons and body armor.
The sadly predictable response of the police in America is to overmatch the “enemy.” Presume they have a weapon for crimes of certain classes, obvious violence crimes like kidnapping and also drug crimes, which poor Afroman was accused of both.
Personally, having been SWAT’d as a young man, it’s not that I think they shouldn’t have access to armaments. It’s that their rules of engagement are obscenely lopsided to the point that they just bring them always, all the time, and will not use common sense judgement.
This could have been a knock-and-talk from Officer Friendly and if things didn’t go well - send in a higher level of officer. Starting at bootleg Navy SEAL raids for every accusation is a blight in modern law enforcement.