Well I think the problem lies in that all his examples were from outside the US, and not only during 2018 which is when and where you gave an example. Here's another source that is only in the US that seems to agree with Wildgoose [1](pdf) from 2010-2016. This source certainly doesn't count as many deaths (note your link said their were 313 deaths from right-wing extremists from 2009-2018) it only goes from 2010-2016 saying there were 140 deaths (note your link also says 50 deaths happened by right wing extremists in 2018). I'm not sure what the discrepancy is there in not accounting for all the deaths from your link. This link states that from 2010-2016 68 deaths were from Jihadist-inspired terrorists while 18 deaths were from white nationalists and extremists. Yet again it would be nice to see data from the whole of the West.
Just to give you another source from the same people which seems to agree with Wildgoose's parent atleast with its reasoning (albeit by making a few qualifiers on the dataset that bend it to be in favor of that reasoning) [2] from 2001-2016 in the US.
Just to give you another source from the same people which seems to agree with Wildgoose's parent atleast with its reasoning (albeit by making a few qualifiers on the dataset that bend it to be in favor of that reasoning) [2] from 2001-2016 in the US.
[1](pdf): https://www.start.umd.edu/pubs/START_IdeologicalMotivationsO... [2]: https://www.start.umd.edu/pubs/START_ECDB_IslamistFarRightHo...