If we don't tolerate the intolerant, if we had not allowed him to expose their xenophobic, populist and demagogic ideas; if we had prevented them from going up to power, the world could be better and we would not allow the diffusion of the ideologies that characterised the historical right.
We never learn from mistakes which we made in the past.
The ancient Greeks felt the hospitality towards a foreigner a sacred duty. But in the latin world, since antiquity, sometimes there is a sort of racism, in particular in "De origine et situ Germanorum" of Publio Cornelio Tacito are mercilessly attacked the uses and customs of very different cultures.
Today there are many walls in the world that separate cultures and civilizations and Trump is going to build another "big, beautiful wall", because he wants to keep the promise that allowed him to have the consensus among the masses.
This is the problem: The people agree. We prefer to build walls and not bridges. We believe that by building walls and controlling in a police way our lives can solve the problems of the present.
But I wonder: Why the humans always had the necessity to prevail over each other and to seek confrontation?
We always make the same mistake again.