Preventing intrusions is praised everywhere by residents alike.
A gated community is made specifically to prevent any free access from outside and it is just like that with sovereign nations as well. You are not welcome if the residents do not want you in.
Donald Trump or Theresa May are not doing anything different. Not only America is failing as United States but Europe has already failed as Union. Whosoever is condemning them, would also prefer living in a gated community somewhere.
Speaking the same language and following the same religion, Arabs have historically failed to become one people. Now they are killing each-other and a plethora of their refugees have entered into Europe, threatening local values everywhere so preventing intrusions is praised everywhere by residents alike.