They're not 'hiding behind it'. They believe that suppressing speech makes extremism worse in the long run.

Speech has limitations, but banning an entire social media network at the decision of tech oligarchs instead of the actual legal limits on speech is a precedent many see as escalation of the conflict. I do. This is a giant mistake that will breed resentment and do nothing but confirm to Trumpists that there is, in fact, a conspiracy against them.