Good, so you found the stats for right-wing terrorist attacks in Europe.Just because you didn't hear about it, doesn't mean it isn't happening.
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Terrorism in EU: Note how right wing + ethno nationalist/separatists which is also right wing extremist is the largest share:
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You also hear about Islamic extremism more than right wing extremism due to biases in reporting.
Also am sure this isn't comprehensive:
List of right-wing terrorist incidents in Europe - Wikipedia
en.wikipedia.org
Now compare muslim terror attacks vs. right-wing terror attacks in Europe from these wiki pages, and tell me who's committed more terror attacks over the last 25 years. Muslims or right-wingers?? And also tell me which side has caused more deaths in total, Muslims or right-wingers??
Muslims: https://en.wikipedia.org/wiki/Islamic_terrorism_in_Europe
Right-wingers: https://en.wikipedia.org/wiki/List_of_right-wing_terrorist_incidents_in_Europe
When you're done figuring out the math, we'll move on to the North-American stats