Earlier quoted context omitted.
I'd argue allowing some intolerance is required because no system is 100% anything. Your comment shows the exact sort of thinking the people you're responding to are going off on. The issue is people are trying to implement nonviolent communication principles in communities without learning how to process the world through the lens of nonviolent communication. And others are using the natural misunderstandings as evi…
Karl Popper wrote on this subject and I've yet to find a suitable rebuttal. The intolerant cannot be tolerated because doing so would lead to the elimination of tolerance. His justification is whether the intolerant are willing to discuss things rationally or whether they will steamroll you without any concern for intellectual integrity.
When we try to outlaw people being themselves, we overlook their needs. That isn't a productive framework and will ultimately compile into systemic issues over time. Tolerating intolerance says nothing about timberline, types of intolerance, scale, etc. It lacks make and is therefore a problematic principle for governing human behavior.