I don’t see this as a requirement to “tolerate intolerance”. I see this as an explanation of why we’re seeing the results we do. I’ve always had a kind of feeling that the extreme resurgence of the right is a hard reaction to the specific reforms of the left. The more reform, the more angst and reaction. It’s just nice to know this “feeling” has a name, and a proper theory.
Basically, the more social woes we fix, the more conservatives get pissed. Like they need time to adjust to their new reality or something.
So our options are: Pick and choose priorities, and slow it down, or face the right’s backlash, populism, and calls to arms, risking political turnover. This is not arguing appeasement. Just explaining their behavior, and the choices the left needs to make in how they govern. I.e., Slow and steady, or risky business.
Finally, I don’t think the right will ever stop trying to pull us towards The Handmaidens Tale, but given time to adjust to significant societal changes, their base becomes less charged and the backlash is less severe. See: Abortion rights.