The sky doesn't admit borders

Dear Trump ,
there are many discussions started after your decison to build a wall aimed to making safer the Mexico's precarious condition .
I say already at the star that I don't agree with this choise , but I don't want attack you or attack all the people who agree with you and your wall . I only want express my idea so that we can reflect together .
I won't talk about politics , but I'll talk about moral conscience and for do that I'll take like concern a book that I read some time ago . This text talk about Berlin's wall and most tragic events happened for its elevation , watched by pliceman. How many people were died for go over the wall and for reach their loved ones ? They are only numbers , forgotten people ...
All this for say that walls aren't only physicists , but they're psychological barriers , that each people while see a wall think at the mental and social divisions .
And it's inevitable that result already observed in the story of other walls , will costitute the story of this wall .
The mental reaction from population will be the same and this won't bring anything , only more problems .
Social problems will lead to economic problems , cultural problems and even less security.
So dear President Trump what will this wall be for , if not more chaos ? What will this division lead to , if not greater degree ?
P.S. Looking the sky I feel close to all the citizen of the world .
Dear Mexicans ( which aren't all criminals ) look the sky , you are and will always close . Because dear President Trump the sky can't be divided by wall .
The sky doesn't admit borders .