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It's quite easy.
They need a massive amount of foreigners for a couple of reasons.
Pension welfare system: As it is an inherently fraudulent system and structured like a ponzi scheme, it can only be sustained with an ever increasing base. As our birthrates began to fall, it became evident that the system would eventually collapse under its own weight. So taking in massive amounts of foreigners is a last ditch effort to try and save it, even if you don't know if the foreigners will actually be a benefit or pay anything into it.
Divide and conquer: Having a lot of foreigners, and letting them form their own communities is a great way to divide the population, and it is an easy strategy to get many new voters. If you bring them in and promise those populations free gibs, you've created a temporary loyal voterbase that will boost the votes your party gets and keep it in power for longer. However, this is also naive, as eventually those communities will become so large that they'll form their own voting blocs. Unlesss they're so low iq that they fall for every fake gibs promise.
If the population is divided it will also become more difficult for it to oppose the politicians and focus on stuff that matters, as it will also be fighting itself.
The politicians don't care about the future, they're thinking short term, about a way wo save their hides while they're still alive. And honestly? I believe that they will get away with it, as in, they will face no repercussions for their heinous actions in their lifetimes.