Former extreme Liberal/Leftist, raised to be that way, began to become centrist/conservative in 20s. Current IQ, post head injury a in mid 30s 122, top measured IQ while becoming more conservative 147. Problem with being smart is that you can talk yourself, and others, into whole loads of rational sounding rubbish. And yes, all the people coming back to religion and more traditional conservative ways that I know are all very highly intelligent as well. Doctoral students, authors, people who travel widely and engage the new routinely. When I visited a mosque it was the Left wing/liberal peace and social justice types that all asked me if I wasn’t terrified to go then and get my head cut off. Not really sounding much like your idealized liberals, are they?

And, by the way, it’s been shown that Libertarians, often the scariest of the right-wingers and most prone to conspiracy theories about freedom and oppression, share far more of their mental and moral processing with liberals than with traditional conservatives. Liberals think in two spheres morally care vs harm and liberty vs oppression, Libertarians think in only one liberty/oppression. By contrast conservatives, and almost everyone else in the world thinks in 6 moral spheres.
Why don’t you ask the extreme Leftists about their mad delusions and beliefs about groups that control the world. They may have good IQs, but the just use them to confirm their own biases, more than to explore.