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Fact check: Who has committed more terrorist and murders, left or right wing ?

Checked on September 17, 2025

1. Summary of the results

The analyses provided suggest that right-wing extremism is a greater threat in terms of terrorist attacks and murders, with sources [1], [2], and [3] all supporting this claim [1] [2] [3]. According to [3], since 2002, right-wing ideologies have fueled more than 70% of all extremist attacks and domestic terror plots in the U.S. [3]. Additionally, [4] reports that when excluding the 9/11 attacks, right-wing extremists account for 63% of the murders, Islamist extremists for 23%, and left-wing extremists for 10% [4]. Furthermore, [5] states that in 2021, domestic extremists killed at least 29 people in the US, with 26 of those murders committed by right-wing extremists [5]. Left-wing radicals are less likely to engage in violent acts, as suggested by [1] and [1] [1]. However, it is essential to consider the context and specific time frames, as the data can vary significantly, such as the high number of murders committed by Islamist extremists in the 9/11 attacks [4].

2. Missing context/alternative viewpoints

A key missing context is the definition of terrorism and extremist attacks, which can vary across sources and affect the comparison of violence between left-wing and right-wing groups [1]. Additionally, the time frame considered is crucial, as the data can change significantly when excluding specific events, such as the 9/11 attacks [4]. Alternative viewpoints, such as the role of Islamist extremists in committing terrorist attacks, are also essential to consider, as they have been responsible for a significant number of murders in certain time frames [4]. Moreover, the partisan differences in perceptions of political violence should be taken into account, as Republicans and Democrats may have different views on the issue [6]. The rise of social media and partisan division can also contribute to the increase in political violence, making it essential to consider these factors when analyzing the data [7].

3. Potential misinformation/bias in the original statement

The original statement may be misleading, as it does not provide a clear definition of terrorism and extremist attacks, and does not consider the specific time frames and contexts [1]. The statement may also be biased, as it implies that left-wing groups are more violent, which is not supported by the majority of the analyses [1] [2] [3]. The sources that support the idea that right-wing extremism is a greater threat, such as [1], [2], and [3], may be underrepresented in the original statement, while sources that suggest left-wing radicals are more violent may be overrepresented [1]. Overall, it is essential to consider multiple sources and viewpoints to gain a comprehensive understanding of the issue and avoid potential misinformation and bias [1] [2] [3] [4] [5] [8] [6] [7].

Want to dive deeper?
What are the definitions of left wing and right wing extremism?
How do FBI and DHS classify domestic terrorism by ideology?
Which extremist groups have been responsible for the most fatalities in the US since 2000?
Do left wing or right wing ideologies have a higher rate of lone wolf attacks?
How do European countries compare to the US in terms of left and right wing violence?