No evidence that accommodating far right positions in Center Right parties weakens far right parties - indeed the opposite seems to be truehttps://www.washingtonpost.com/opinions/2019/09/04/why-germany-europe-cant-afford-accommodate-radical-right/ …
Well, it's certainly been suggested that one of the reasons the National Front's (UK) vote collapsed (relatively speaking) in 1979 is because Thatcher went hard on the anti-immigration stuff. Hard to isolate variables, of course.
