What percentage of the population in big European cities was of European descent in 1970? What percentage is of European descent now?
Everybody knows demographics in the West are shifting radically due to mass immigration. To call this a "fringe conspiracy theory" is gaslighting in its purest form, not aimed to describe reality in an intellectually honest way but to silence people who don't want this much immigration.
Setting aside the content of your post, it really bums me out to see a right-winger like yourself use the term "gaslighting" unironically. There's some particularly revolting about reactionary messaging packaged inside liberal rhetorical strategies.
Poll
