Protect free speech.
The leftists' "yell fire in a crowded movie theater" analogy does not hold water. Unless the theater really is on fire (and, come to think of it, we do have a racial crisis, so in a sense racial activism is analogous to alerting people to a theater actually on fire, a situation in which it would be morally reprehensible to say nothing), then such a yell of "fire!" is nothing more than verbal vandalism, with no reasonable social or political content or justification.
On the other hand, for example, a principled opposition to genocidal replacement migration and a defense of white racial interests are activities that, by definition, are of significant social and political content. Advocating (non-violent) racial nationalist memes is not an "incitement towards violence" and it is not "yelling fire in a (perfectly safe) crowded movie theater" - it is politically relevant speech no different from having a position on taxes or the death penalty - except for the fact that the sociopolitical implications of racial issues are the most important that one may consider.
What's more important than the future demographic makeup of a nation? Of the world? How can one say that these fundamental issues cannot e discussed? How is that a democracy when the most important issues facing a people are equated to yelling "fire!" and suppressed or even outlawed?
Even the most dim opponent of white racial interests must understand that their reasoning - labeling any speech that they disagree with as "dangerous" "hate speech" equivalent to yelling "fire!" - can be used against them, by anyone with power that disagrees with their views.
Are they do confident that their current high status as the "running dogs" of establishment globalist economies will last forever?