Well I think this is all about money. Polish people can see that western people earn much more money and can afford whatever they like. Polish live from month to month and can't afford  buying a car , going abroad to travel and so on, If they want to have something in life they have  to save money for a half of their life.
So nobody wants to waste their best years of life on repairing poor country and it might not even work. It's easier to go abroad and live your life….