MILLIONS of Poles have emigrated to prosperous nations.
You need to learn the history. Citizens of Poland, one of the few 'exemplary countries' in the EU when it comes to economic and social development, STILL cannot come to the US without a visa. And during socialism, hardly anyone was allowed to even have a passport (if they did, they would be allowed to go to Czech Republic or NRD). Besides, when Poles do emigrate, their first question is NOT: "Where do I go to get the most benefits to milk the locals from their hard-earned money?" - they go to work instead, try to compete the best they can, most of the times get two jobs in order to have a chance to prosper, help their families, and survive. People from Poland, Germany, and the West in general have slowly but steadily learned the game played by the 'poor migrants' - most of them know exactly what they're doing. Their ultimate goal is to get a better life, nothing else. It would be perfectly fine as long as they don't play the victims and not try to scam other taxpayers. In summary - want to the West? No problem, but GET TO WORK and ask about social benefits later. Otherwise, stay in your country.
Here is a typical path of a migrant from Poland:- A man (or woman) goes abroad (alone) and try waters. IF they are successful finding a job, they work hard, save as much money as they can, send some money to Poland. Then, after a long while (it may take up to a few years), once he/she earned enough money to afford to work 1 job instead of 2 or 3, they think about coming together again on a permanent basis.. Then, if they continue liking the new country, they either stay there or move back to Poland.
Here is a typical path of a migrant from Asia or Africa:- They research and sort countries by the best social benefits. 'How much money will I get when I go to the new country as a 'refugee'?' / 'Will the new country cover my medical expenses, my education, will they find me a job?' / 'When I take the whole family with me, will I have better chances to get free stuff?' / 'How much time can I live off unemployment benefits?' / 'How much extra stuff can I get if I'm illiterate.' etc.
The bigger picture in summary may be this. Most migrants really don't like their own countries and their own cultures. In the last years, during the Internet revolution, the younger generation realized they don't want to live the way their parents/grandparents did. But instead of cleaning their own backyard, they choose the 'easier' way - 'migrate' to the West and make mess there (again, keep in mind they don't want to clean up their own country). Nevertheless, that would still be fine (everybody wants to have a better life as quickly as possible), but the culture of corruption they have been brought up in is (at least initially) too strong to defeat and that's the main reason many of them don't assimilate in other countries as well as Poles or migrants from other Easter European countries do.