Based on data from the Cato Institute (up to Sept 2025), since 2020 there have been 81 politically motivated murders in the US: over half linked to right-wing ideologies, 22% to left-wing, 21% Islamist, and 1% unknown. Sources like ADL and CSIS also show right-wing extremism as the primary driver in recent years, though incidents occur across the spectrum, including the recent Kirk case.

The input states that since 2020 there have been 81 politically motivated murders in the US, with over half linked to right-wing ideologies, 22% to left-wing, 21% Islamist, and 1% unknown, citing the Cato Institute data up to September 2025. It also references corroboration from organizations like the Anti-Defamation League (ADL) and the Center for Strategic and International Studies (CSIS), which reportedly identify right-wing extremism as the primary driver of such violence in recent years.

However, the only source provided is a general news archive search link without direct access to specific reports or datasets from these organizations. There is no direct evidence or detailed data from the Cato Institute, ADL, or CSIS included in the search results to confirm these exact figures or percentages. Without access to primary or detailed secondary sources explicitly confirming these statistics and their ideological breakdowns, this claim remains unverified.

Additionally, the mention of a recent 'Kirk case' is not substantiated by any source details.