Another possibility that is surely called a conspiracy theory is to create conflict in society, so the government is allowed to put in place the desired solutions like increased systemic surveillance and more violent police. It's an effective way to erode civil rights.

> I think the actual reason is something like a vast western empire promoting diversity as a good thing for your country.

The diversity train is a relatively new phenomenon.

EU expansion to the East had many factors. One of them being to have less barriers to get a cheap seasonal workforce pick vegetables in western EU countries [1].

Go back a few more decades: Germany in particular asked hundreds of thousands of people from Turkey to immigrate into Germany to help rebuild it after WW2. It's now the biggest foreign-origin population in Germany.

Not sure about France though.

[1]: https://www.nytimes.com/2017/12/11/business/europe-labor-rig...

> Germany in particular asked hundreds of thousands of people from Turkey to immigrate into Germany to help rebuild it after WW2.

Not quite, because the earliest wave of Turkish immigrants came after the migration agreement between Turkey and Germany in 1961 (and Germany was rebuilt at that time). The reasons for this agreement – initiated by Turkey – were curiously complex and not simply economical ones.

On the other hand countries like Japan are having a demographic crisis where they have populations that are very old because there aren’t as many young people, and one of the primary reasons Japan doesn’t have as many young people as other countries is because they have very strict immigration laws.

As a person whose parents are from India I take offense to the idea that family values in western countries are somehow incompatible with immigrants, both of my parents came to the US separately and decided to get married and have kids out of their own volition. Europe obviously has separate problems and migrant workers aren’t exactly the same as tech workers from India coming to the US but just because other cultures are different doesn’t mean they’re from alien planets or something.

Having children is not really the problem although what family values are differ across cultures (monogamy vs polygamy, etc) and as I said, I don't think immigration into western countries is strictly because of a lack of workers. There is a deliberate plan in place to change the demographics of western countries to be more favorable to those in power. Things like the Diversity Immigrant Visa and the deliberately uncontrolled immigration into western countries right now are completely detached from a need for workers. The US is actually spending money to undermine Hungary through NGOs because Hungary is attempting to control immigration. H-1B even keeps wages down. The benefits of this accrue to a very small class of people.

Although I am sympathetic to Indians, I think people in India would not like it if a lot of Europeans showed up. It says here that Indians are 3.1% of the population of Great Britain https://en.wikipedia.org/wiki/British_Indians. I can't imagine Indians would appreciate it if 3.1% of India were European immigrants. Neither would people in a lot of other countries. I think people in the West have a right to their own culture if other people do because the nation of immigrants propaganda is revisionist. Japan has chosen not to import people. I don't think the choices are to let people in or die.