In a number of western countries that are more used to peace than war, outside war and inside living memory (hence talking about post-WW1), the biggest massacres have been perpetrated by Islamist terrorists. AFAIK they hold the record in the UK, US, France and Spain. In the UK, incidents with smaller body counts led to the restriction of firearms. They were spaced a decade apart, yet they and their signature laws are still remembered. In 2005, the 7/7 attack and another similar attack with the same MO were spaced a few weeks apart. The first killed 50+, while we were lucky the devices in the second attack malfunctioned. There was one in Scotland around the same time as well. And those are the ones that are publicly known and that I can remember offhand. NB. I've discounted the ones with melee weapons, as they don't involve the same kind of sudden mass killing as the other examples.
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