Have seen boat vids of them proudly displaying Machetes for the camera, and using them in destination countries

I would make a distinction between the theory of multiculturalism and its practice, but I see the point

Multiculturalism happens automatically and organically in an interconnected world with easy travel - it doesn't need a theory. The forced mass-version is a death wish, and doesn't have proof of making anyone 'stronger'. It should be considered treason against a Nation, which you could easily make a case for