[tcptomato]

3000 people died on 9/11 alone. Spreading it over 50 years, makes it 60/year. Where did you get the 4 from?

[nostrademons]

It's the median, not the mean. Here's the raw data:

https://en.wikipedia.org/wiki/Terrorism_in_the_United_States

The median is more relevant than the mean simply because it's less sensitive to outliers. 9/11 was an outlier; 85% of all U.S. terrorist deaths in the last 50 years happened on that one day.