> Because isn't the whole theory that people are the same? If so, you're just adding new people who are exactly the same as the existing people.

That's a very dumb theory. People cannot just be exchanged: you cannot take say, 60 million people out of Bangladesh, put them in Japan, and expect Japan to stay the same. Just as you cannot take 60 million Japanese, put them in Bangladesh, and expect Bangladesh to stay the name.

That's a fact. But I could give a shitload of historical examples too... Here's one: when white and black people arrived in the americas, there was still cannibalism taking place in both northern and southern america. The americas had neither white nor black people. Today there's no cannibalism anymore and there are not many kids sacrifices happening in the US to please Inca/Maya gods anymore either.

A slightly more reasonable theory is that if you import people through immigration at a reasonable rate, you can assimilate those people. For example for a long time in Europe female genital mutilation wasn't a thing anymore. Now sadly due to mass migration, ask any ob-gyn doctor in western Europe what he sees and what kind of act he has to do: like re-stitching hymens to pretend the women-to-be-married are virgins (because, yes, there are patriarchal cultures where men are going to inspect a woman's hymen to make sure she's a virgin).

People just live in a fantasy land in their heads: there are 300 million women alive, today, who've been genitally mutilated (that's a very sizeable percentage of all the women out there). What's actually ongoing is weirder and shittier than most people realize.

I say good for Switzerland to curb immigration a bit.

People may be not dissimilar but cultures certainly are.