The European society is divided on the subject of accepting 'foreigners' (nie jest jasne dla mnie, kogo nazywasz tak, bo kazdy, kto nie jest native danego kraju jest 'foreigner') from many other countries. Let us consider advantages and disadvantages of such 'a controversial policy' (ale jeszcze nie podales mi, dokladnie co ta 'policy' ma na mysli, i dlatego, ona nie moze byc 'controversial, bo ja nie wiem jaka ona teraz jest).
The believers of 'European values' (a dokladnie - jakie to sa 'European values' ?) more often mention about the leftist policy of the European Union that led to assassinations in France, as well as(,) (nie rozumiem dlaczego tu jest przecinek) acts of rape in Cologne(,) (nie rozumiem dlaczego tu jest przecinek) last year. According to them, an increase of foreigners will bring 'destruction of Europe about' (cos tu nie tak z tym...slowa sa w zlej kolejnosci...will bring about the ...). As far as economic issues are concerned, most of foreigners who live in Europe 'are aimed being on the dole.' (tego calkowicie nie rozumiem) As a result, mass social security (tutaj trzeba doda 'payments', bo samo 'social security' nic nie zrobi) can take down (brakuje przedimka) 'finance of state' (wg mnie zle slowa, moze 'the financial instability of the state)... that is 'not reach enough' (tego nie rozumiem) to (przedimek) level of bankruptcy.
Such responsible and hardworking (tutaj brakuje rzeczownika, np 'people') are being welcomed on the European labor market. Last (tutaj brakuje przecinka) but not least (tutaj brakuje slowa, np. important) issue is (przedimek) support for families and their children from (przedimek) war areas. Those people expect our help and kindness in such a cruel moment of their 'life' (tutaj ma byc l. mnoga, bo masz slowo 'people').
To conclude, I think the multicultural policy has not worked in practice because many Europeans are afraid 'of' (nie, tu masz zle slowo, ma byc FOR...pamietaj, 'I am afraid OF my children' jest calkowicie cos innego jak 'I am afraid for my children' - co chcesz powiedziec) their safety. Acts of vandalism and terrorism in western European countries should 'make a' (zle slowo, moze 'construct) barricade against accepting too high (przedimek) amount of foreigners (ale gdzie? musisz napisac)