The Paradox of Tolerance disappears
if you look at tolerance, not as a moral standard, but as a social contract.
If someone does not abide by terms of the contract, they're not covered by it.
In other words: since the intolerant are not following the rules of the social contract of mutual tolerance, and have broken the terms of the contract, they are no longer covered by it, and their intolerance should NOT be tolerated.
inspired by "Tolerance is not a moral precept" by Yonatan Zunger