No but you have to convince people who are undecided somehow. Also i think you should judge peoplenby their value, but their value could be that they have a different culture. Once you move to a multicultural place its really hard to move back to a monocultural place because you just have less options, perspectives, etc. This is why erasmus is also a great thing for example. It allows people from different cultures to meet, form relationships, etc. Of course this is a different way of measuring “value”, not economical but social and cultural.