Your definitions of unacceptable speech & legitimate threat are unclear, and people nowadays make claims loosely. If it means demonstrable harm, then they’re fine & I apologize for the excessive caution.
From context
Rawls emphasizes that the liberties of the intolerant should be constrained only insofar as they demonstrably affect the liberties
and key words
only when the tolerant sincerely and with reason believe
and my direct statement
speaking one’s mind is not an act that directly & demonstrably harms/threatens security or liberty
I’m stating reasons of demonstrable harm are largely absent in speech. Speaking one’s mind doesn’t cause harm. Harm requires an act.
Tolerance is the allowance of objectionable (expression of) ideas & acts. That objectionable acts directly & demonstrably harm/threaten security or liberty is an easier claim that fits Rawl’s conclusion consistently. That speech alone can do so is a more difficult claim: maybe only false warnings or malicious instructions that lead to injuries or loss of rights, coercive threats, or defamation.
Complaining about semantics isn’t the argument you think it is. Meanings & distinctions matter.
The distinction between definite, demonstrable harm and lack thereof is crucial to justice. If you’re willing to undermine rights for expressions that won’t actually harm/threaten, then I don’t care for your idea of justice & neither should anyone.
No & already answered.