Unconditional Basic Income- opinion paragraph bout a matter that I consider important

The Unconditional Basic Income is one of the most stupid economic theories that I've ever heard. This theory must never be imposed. The UBI is a economic proposal that offers money to every citizen of a country, these citizen don't have to do anything for earn this money. In a beginning, this could be a great solution for all the poverty of a country, but at the far end, you are only increasing the incompetence of the country, due to the fact that people won't have to give their best for the work they should all give, so people won't see their jobs as an obligation, which seems to be good, but they will see their jobs as a waste of time since they are going to earn that money anyway. But this is not the worts part of this theory. People from other countries who want tho have a better life would also look forward to live in this country, and there is no country in the world which can face this fact. In the end, you have to strengthen the frontiers if you want to keep this way of life, so people from other countries who look forward to work in better conditions than their respectivecountries offers them, won't be able to reach their drams. To sum up, if the western world applies this economic theory, in a few years, we will have developed a social segregation, separating the rich world from the poor world.