The economic impact of immigration

[Universe]

One of the common arguments to support open border / pro-immigration policies is that "our economy needs these people". They say our society is too aged so we need workers from foreign countries who subsidize our pensioners/welfare state. However taking in immigrants also increase the amount of people who use welfare state, because - like natives - immigrants also use public services, healthcare, pension etc. Some people even say certain immigrants use welfare more often than do natives (I couldn't find statistics on that though). Why is this aspect of immigration ignored?
Is there an article or study that shows immigrants and descendants of immigrants have a positive lifetime fiscal impact on the country's economy?

[Jaromir]

someone has to work for refugees welfare

U naszych zachodnich sąsiadów rozpoczął się wysoki sezon na prace tymczasowe. Sytuacja epidemiologiczna powoduje niedobory kadrowe i zmusza firmy do walki o polskich pracowników.

The high season for temporary work has started at our western neighbors. The epidemiological situation causes staff shortages and forces companies to fight for Polish employees.

https://biznes.interia.pl/praca/news...ow,nId,5237528