With Germany it is perhaps the rise and fall of Nazism - which has vaccinated the German people against the virus of "extreme racial nationalism"
No catastrophes to remember
Perhaps the closest is WW1, where Britain blundered into a war
Creating a climate of pacifism that persists in the West
Maybe the Kurukshetra war of legend serves as some kind of vaccine, which put an end to many cultural practices among brahminical elite that were likely prevalent before that "legendary event"
E.g. he says Indians used to eat "cow meat" before the age of vAsudeva. But not since.
Creating a v strong anti-muslim sentiment that still persists in the populace
So Indians don't see the British Raj as a civilizational vaccine. At least I don't think so.