My read of Popper was that we should be prepared to even use force against intolerant people who are not willing to engage in rational debate.
What Popper didn't anticipate is that the square of public opinion would become the internet, and a big question this creates is if the internet is a place where rationale debate and proportional representation of ideas is possible or not.
If the internet were to make the public square of opinion a place of irrational debate, I think Popper would be very much against it, and would want us to do something about it.
Here's a quote from him:
> as long as we can counter them by rational argument and keep them in check by public opinion, suppression would certainly be unwise. But we should claim the right to suppress them if necessary even by force; for it may easily turn out that they are not prepared to meet us on the level of rational argument, but begin by denouncing all argument; they may forbid their followers to listen to rational argument, because it is deceptive, and teach them to answer arguments by the use of their fists or pistols
So the condition he puts forward is: can we counter the intolerants on the internet by using rational arguments? If we can, than suppression (he claims) would be unwise, but if we can't, than suppression by force (he claims) might be warranted.
To me it seems he’s clearly saying that if they decide to use force then we should be prepared to respond in kind not that we should use force to suppress irrational argument. The end of the first sentence maps to the end of the second.
How I interpret it is not that we should use force to suppress irrational argument, but that if we are failing to counter intolerance with rationale argument in the public opinion, than we should be prepared to do even more to counter it, maybe even to use force. And then he lists examples of what he'd consider cases where more than just countering with rationale argument would be justified, and those are: denounce all arguments, not willing to discuss at a rationale level, not willing to listen, believing they are being deceived, using pistols and fists.
What Popper didn't anticipate is that the square of public opinion would become the internet, and a big question this creates is if the internet is a place where rationale debate and proportional representation of ideas is possible or not.
If the internet were to make the public square of opinion a place of irrational debate, I think Popper would be very much against it, and would want us to do something about it.
Here's a quote from him:
> as long as we can counter them by rational argument and keep them in check by public opinion, suppression would certainly be unwise. But we should claim the right to suppress them if necessary even by force; for it may easily turn out that they are not prepared to meet us on the level of rational argument, but begin by denouncing all argument; they may forbid their followers to listen to rational argument, because it is deceptive, and teach them to answer arguments by the use of their fists or pistols
So the condition he puts forward is: can we counter the intolerants on the internet by using rational arguments? If we can, than suppression (he claims) would be unwise, but if we can't, than suppression by force (he claims) might be warranted.
At least that's how I interpret Popper.