After living in a country for 12 years, you legally are a resident. Additionally he is obviously a highly skilled worker considering he works for leading tech

After living in a country for 12 years, you legally are a resident. Additionally he is obviously a highly skilled worker considering he works for leading tech companies, therefore you cannot consider him an average Joe bricklayer who can be compared with others as he is in a percentile that is in demand (there is a shortage of these people). Two people are hardly ever equal when it comes to applying for a job, its not just about skills, its about the people, its about the experiences they have had. I would always employ a person with more life experience than not, and traveling, learning a new language, a new culture is apart of that. It takes bravery, courage and stamina to uproot your life and move to a new country and these are all respectable traits. So respectable in fact, that the fear of these people by society is blatantly evident. You forget that we are all citizens of the world, and people move around for many different reasons. Just because you are happy to stay in your cultural bubble doesn't mean other people are. And if these people are skilled and can contribute to the economy, even better.