But then there was this: https://twitter.com/NatSecGeek/status/1273329710576152581
https://www.csis.org/analysis/rise-far-right-extremism-unite...
https://www.americanprogress.org/issues/security/reports/201...
https://www.nytimes.com/interactive/2019/04/03/world/white-e...
https://www.theatlantic.com/ideas/archive/2019/01/homegrown-...
So right wing terrorism is a greater threat, unless you are worried about being killed.
But if asked "Are you more worried about right wing or islamist extremists?", my answer is "Yes".
Whereas something that is well known and homegrown in the USA (Timothy McVeigh, anyone?) has had a much lower level of concern assigned to it until very recently.