Now really wishing could find a decent analysis, instead of digging around a Wikipedia link. The site does state the listing is incomplete, but will assume the data for the last twenty years is likely to be fairly accurate for the US and Europe. When analyzing the tables for the Americas and Europe, the US displays 36 spree killer instances in the last twenty years, while Europe displays 33. Considering the population of Europe is 2.3 times the US, one could conclude Europe statistically has twice the instances of spree killings as the US. However, the Americas and Europe tables do not include educational and workplace killings, which the US is the clear front runner. So to be fair, added the 12 workplace and 14 educational US instances in the last twenty years, while not bothering adding anything for workplace or educational settings for Europe. That brings the total US instances to 62 compared to the previous stated 33 for Europe. Calculating the population of Europe as rounded down to twice the size of the US, the statistical occurrence of spree killings would appear to be close enough to consider as equal. The fact mass murder is often viewed as primarily an American issue probably speaks more to the narrow focus of national news. Edited to add, a ten year analysis using the same fairness of adding workplace and educational to the US and not Europe, yields the same results. In fact, the ten year totals are almost exactly half the twenty year totals, indicating nothing much has recently changed.