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.
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.
In homogenous societies like japan, Sweden, and Denmark it usually leads to a lot of ethnic contradictions once the immigrant population passes a certain threshold.
Once has to wonder whether it’s healthy when more than 50% of your population feels alienated by the country and often has more loyalty and love for the homeland he or she fled.
The immigration system of most European countries is also very broken. More than 60% of immigrants to France don’t even have a high school education and gun crime in Sweden is now among the highest in Europe (despite being the lowest in the 90s) due to Somali gangs.
People are tribal and not every country was birthed as a “melting pot” like the US or Canada. These days the words integration and assimilation are considered racist when talking about immigrants so societies in these countries will simply further polarize.
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.