By making poor people breed you are just creating problems for the future, such social breakdown
Poland is relatively poor compared to the West.
That logic amounts to, "Poles shouldn't breed because they're generally quite poor."
The majority of Poles cannot afford children. It doesn't mean that the majority of Poles would beget criminals if they had children. This sort of attitude is unhelpful, and it betrays a disdain for the Polish populace at large.
And, I'm sorry, but Poland can't afford to wait 50 years to catch up with Western Europe before it starts procreating again. If it waits any longer, it will never catch up because it will be crushed by the burden of an ageing population before it ever gets there.
The fact that people misuse resources provided to them by the State is a fact of life. Let's say the government gave a monthly payment of 1000 zł to every family with 3 or more children. That's 1.7 million families, and would amount to the transfer of about 20 billion złoty a year, or around 30 billion złoty, if you include the likely administrative costs. The current budget deficit is 35 billion złoty, so this hypothetical scenario isn't out of this world.
Now, some people would feel more secure and could afford to have more children and could spend the money on children's clothes, schooling, food, vaccinations, daycare and what-have-you. Great! Some would now be able to afford to spend the money on Playstations, OLED HDTVs and holidays. Great! And yes, it's inevitable that some pathological families might spend it on drugs and alcohol too.
That's the problem with government assistance in general, as 20th century experience has shown. Government assistance is expensive to administer, and it's definitely a blunt instrument with many unforeseen incentives and consequences. But it's an effective instrument nonetheless.
Where such money is spent on luxuries instead of childcare costs, it would still have a positive effect in that having children wouldn't necessarily mean sacrificing one's quality of life. That's all the more reason to have more children if you want them. Even if the money isn't spent on children, it would still be an incentive to have them, which is what the Polish state should be attempting to achieve, since it needs future taxpayers.
As for Russian racism, it's inevitable. Russia is a huge, multicultural country with people of various religions, languages and ethnicities. The Russian government does what it can in russifying them through the promotion of Russian language and culture, but that's a process that takes many generations. And wherever you have multiple races living in one country, you will have racism, be it in Russia, the US, or the UK. It's unfortunate, but the problem can be ameliorated with time.