>People usually say that one shouldn't be allowed to immigrate wherever he wants
That is a very weak position, do you actually believe things can be true because "People usually say that"? Either immigration between countries is wrong in some way that generalizes to immigration between cities, or you can't use the fact that immigration is by default illegal to support your position.
Not allowing unrestricted immigration between countries is usually a pragmatic consideration, that is related to how countries usually spend their money vs. how they earn their money. Social expenditure, for instance, is usually planned based on the amount of tax the state gets from an average citizen, importing a lot of people who will pay less in taxes means you either have to degrade the quality of service for everyone, or start discriminating between people when spending on them (which betrays the concept of welfare spending as a 'safety net' - it's supposed to serve people who can't earn enough to provide for themselves or their family). Sometimes anti-immigration sentiment is motivated by nationalism or racism, even to the extent that people aren't allowed to live where they were born, and it would be a shame to reproduce those ideas on a city level.
That is a very weak position, do you actually believe things can be true because "People usually say that"? Either immigration between countries is wrong in some way that generalizes to immigration between cities, or you can't use the fact that immigration is by default illegal to support your position.
Not allowing unrestricted immigration between countries is usually a pragmatic consideration, that is related to how countries usually spend their money vs. how they earn their money. Social expenditure, for instance, is usually planned based on the amount of tax the state gets from an average citizen, importing a lot of people who will pay less in taxes means you either have to degrade the quality of service for everyone, or start discriminating between people when spending on them (which betrays the concept of welfare spending as a 'safety net' - it's supposed to serve people who can't earn enough to provide for themselves or their family). Sometimes anti-immigration sentiment is motivated by nationalism or racism, even to the extent that people aren't allowed to live where they were born, and it would be a shame to reproduce those ideas on a city level.