Ideological Segregation is a social engineering strategy that consists in polarizing the public discourse and political/cultural landscape in such a way that the truths are split as evenly as possible among 2 opposing ideological factions, and deeply interwoven with lies.
In order to mantain its power, every ruling elite needs an ideology or a narrative in order to persuade people to support their power. However, any ideology that is almost exclusively made up of falsehoods is too easy to unmask; once this happens, its rejection will inevitably open the path toward the truth; as long as the discourse remains so clearly divided, sooner or later the entire population will eventually flee from the regressive ideology and flock to the empowering one, no matter the amount of propaganda employed to defend the first and/or attack the latter.
For this reason, the modern ideologies and narratives are systematically manufactured in order never be *entirely* wrong, but to always include a specific amount of truths among the lies: one ideology speaks the truth on issues where the other lies, and vice-versa; in such a way to make the lies seem inherently dependent from the truths (by employing profuse amount of fallacies and other manipulation tactics) in order to present this mix of truths and falsehoods as a coherent, monolithic whole. In this way, any weak-minded person that recognizes the truths will be manipulated into agreeing with the lies too; instead, those who recognize the lies, will also reject the truths, coming to a diametrally opposite opinion that is right where the mainstream one was wrong, but wrong where the mainstream was right.
Since, logically speaking, true and false = false, the result of this social engineering program is that both sides are guaranteed to always end up with a fundamentally wrong worldview and thus never be able to achieve true emancipation.
The additional advantage is that, by confirmation bias, each side of the debate will only see the truths on its own side, and only the lies on the opposite one, gaining constant confirmation that its own side is the "right" one and the other is the enemy, with the effect of promoting division and infighting among them, and preventing them from any constructive cooperation towards the truth.
"I cut, you choose".