[walkhour]

Do you think immigration has disadvantages? Could you name them?

For some people the disadvantages outweigh the advantages (like offering a solution to birth rates, provided low birth rates are a problem). Immigrants and their descendants can and have swung election results. Nothing wrong with this but for some people this is too big of a disadvantage.

This shouldn't surprise you, there are many countries with very little immigration, very strict immigration laws, and low birth rates, so for them the disadvantages outweigh the advantages, and they are not even democracies.

[marvin]

Immigration is much more complex than a yes/no or a 0-100 scale. What cultures do the immigrants come from? How is the host culture's traits for integrating them? What persons from the foreign society actually become immigrants?

The USA is historically incredibly successful in attracting and integrating immigrants that go on to have great success. While e.g. Sweden appears to have an alarmingly high proportion of immigrants that go on to act in ways that are detrimental to their society. There might exist examples that illustrate the example in a way that's even more obvious.