An excerpt of his thoughts on this subject, very interesting to contemplate the political implications of this:

"The Most Intolerant Wins: The Dictatorship of the Small Minority" [0]

[0] https://medium.com/incerto/the-most-intolerant-wins-the-dict...

"...Clearly can democracy –by definition the majority — tolerate enemies? The question is as follows: “ Would you agree to deny the freedom of speech to every political party that has in its charter the banning the freedom of speech?” Let’s go one step further, “Should a society that has elected to be tolerant be intolerant about intolerance?”

> Popper abhorred philosophers who argue that scientists adhere to theories for cultural and political rather than rational reasons.

Well, he might abhorred them, but he was empirically wrong in tons of cases on the matter.

And so is also Popper's student George Soros.