"We don't encourage people to commit terrorist attacks, we only encourage them to do what it takes to ensure the survival and dominance of the white race."

Who would you consider that to be, please?

ISIS ideology is about killing the infidels and actually doing it

I really hope you're not going to offer a 'no true Scotsman' argument for why the people who do commit murders or other terrorism in support of WN ideology should be considered as separate from the people espousing said ideology even though quite a lot of them advocate exactly such action.

'Survival of the white race' suggests there is some looming danger of extinction, a position which seems to have little foundation in fact and mostly depends on the trope that non-white people are rushing to outbreed everyone else - ignoring abundant data showing that high birth rates are correlated with poor mortality outcomes and extreme poverty, and move in inverse proportion to economic security.

I might add that obfuscation and misdirection are key components of far-right recruitment strategies. Refer, for example, to the style guide from the editor of the Daily Stormer, which emphasizes the rhetorical use of humor, irony, and ambiguity to obfuscate the primary agenda while still achieving emotional activation: https://www.huffingtonpost.com/entry/daily-stormer-nazi-styl...

If it quacks like a violent duck ...

> White nationalists say they seek to ensure the survival of the white race, and the cultures of historically white states. They hold that white people should maintain their majority in majority-white countries, maintain their political and economic dominance, and that their cultures should be foremost. Many white nationalists believe that miscegenation, multiculturalism, immigration of nonwhites and low birth rates among whites are threatening the white race, and some believe these things are being promoted as part of an attempted genocide.

And the same paragraph with a few substitutions:

> [Sunni militants] say they seek to ensure the survival of the [caliphate], and the cultures of historically [Islamic] states. They hold that [Islamic] people should maintain their majority in majority-[Islamic] countries, maintain their political and economic dominance, and that their cultures should be foremost. Many [Islamic] nationalists believe that miscegenation, multiculturalism, [and] immigration of [non-muslims] are threatening [Islam], and some believe these things are being promoted as part of an attempted genocide.

ISIS may be comparatively more violent than white nationalists[1] but as far as ideology goes I struggle to see "two very different things" as you've suggested.

[1] At this moment in history at least - the Nazi party certainly fits the Wikipedia definition of "white nationalist".

This is the slippery slope you are walking down here.

So far I’m pretty unconvinced.