See the problem here is that you're actually thinking about the issue rationally. If you're trying to understand the leftist mindset that's your first mistake.
You saw their "solution" during Biden's term. It's to just sit there with the border wide open. Every human being is completely the same no exceptions. The "right" and "compassionate" thing to do is to just let people do whatever they want. Who cares about that whole "permanent underclass" shit? Just feel good because a brown person is happy bigot.
The left mindset is rational. You like many conservatives and are stupid enough to take them at their word about their motivations and why they do things.
Once you realize that their morality and mindset is based on what is best for them (gives them the most power) and makes them feel the most good at any time, and that billions if not trillions of dollars has been spent to hack what makes them feel good (at least temporarily). Everything they do makes sense.
The leftist white male has been conditioned sense birth that racism bad, white people bad, we are all same race, dont say that, its racist. Some break out. Some dont. Breaking out hurts and is painful, so they do what "makes them feel good". Where the left's cultural control is breaking down is the carrots they used to give to make people go down their preferred paths are either rotten (modern media is so pozzed normies can tell now, but it was always pozzed sense the beginning) or now non existent. Star Wars having the good guys be the "multi cultural" force was subtle but less in your face, now its obvious with all white men bad, only colors and women can be heroes now. Its rotten. It used to be if you smiled and agreed with Mr Goldenstein about how being mean to niggers was bad you got a job, a house, and a family. Now the job is being given to a dirty jeet who is obviously making the world a worse place. So the men are breaking out. Even hispanic and black men are breaking out. Women still get carrots so they are still mostly aboard, but some of their carrots are going to trannies now, so now FINALLY they rebel too. Their cultural rot tolerance is much higher, but they never actually gave a fuck on if anything was good or not to begin with.
Conservative ideas are based on these objectives principals and ideas. Either lofty ideological ideals, or Theistic ones like "god said to do X or Y". Conservative thought is based on axioms that ground perception. Liberal thought is based on relatively and what is best for them or makes them feel good at the moment. Niggers didnt support Trump, but they sure as fuck stayed home. If Trump was a nigger, they would have turned out for him just like Obama. The decisions were purely transactional. The leaders in their community will never turn on Democrats, because Democratic power structures give them control over areas. If the only way a bunch of niggers could get control over a major metro area was go Republican, they would go Republican. This shit aint complicated. Its about power and the transaction of power. White liberals its really simple child fantasies of "if i had absolute power every bad thing would be punished, and the good would be rewarded". But because their morality is rooted on power and not axioms, good and bad are at best defined by the masses, and at worst have no definition at all.