The more developed country should have a less restricted immigration policy on skilled labours

From my personal aspect, I of course want all governments to loosen their immigration restriction so I could move around the world more easily and have more opportunities. However, there are always some people that want their governments to make immigration impossible. Donald Trump had inappropriate comments on Muslim immigrants.  His comments were made based on his naive belief of if Muslim immigration was banned, there would be no Isis attacks on American soil. Such action could increase the difficulty for Isis to arrange an attack on America; however, I don't believe it will reduce the possibility to absolute zero. Moreover, such action could only worsen the problem and push moderate people towards radical groups. 

However, loosening immigration restriction is also not very popular. Allowing more immigrants into a country increases the level of competition in the society across its labour market, good markets and so on. It is very sensible that the government protects its unskilled labour force from the competition from outside. However, when one country's labours are well trained, the government should withdraw its protection. By encouraging competitions, the labour force could remain competitive and productive. With overprotection, the labour force could become less productive as they have very limited incentives to work harder. Therefore, I think the more developed country should have a less restricted immigration policy on skilled labours as it has well trained labour force that is capable to face the competition from outside.