What do the police in those countries do differently?
If you want to discuss a topic in a productive manner, the first thing to do is to honestly say something about what you believe and why.
What actual observations of the world led you to your generalizations?
To stop a shooter? Yes it is.
https://www.ojp.gov/pdffiles1/nij/grants/223855.pdf
I don't think that most SWAT responses are actually saving lives with bullets. Also included in that paper is a table showing that most frequently, SWAT is used to serve warrants.
If a warrant serving situation seems dangerous enough to use SWAT, I hope they use them and no rounds are fired. That’s a good warrant service, not a failure, in my book.
"After receiving a phone call concerning an active shooter situation, the force sent round a single officer, just to double-check. The officer was among the 7 killed by the gunman."
Remember the story of the boy who cried wolf? The sheep were slaughtered because the town stopped trusting him. I'd rather the police scare a few unlucky people and waste some resources than learn to distrust our cries for help. Of course it's a tragedy that someone lost their life, but how many lives would be lost through not mobilising enough police?
To take this further if someone malicious caused me to do something catastrophic at work should I be absolved of all accountability? Sure, I am not the person who did the malicious thing because I had no intent, but I did still do it. Maybe I shouldn’t be fired but the security policies and procedures should be changed for the entire company to prevent this from happening again.