There is not enough harmful speech to justify the government limiting it.
These policies should not be necessary, since the fundamental drive for people is acceptance within a group. By making that group inclusive enough, the words said would have no impact on the people as a whole. The collective census would remain the same, and would evolve over time in relation to humanity itself. The need for these laws come from fundamental human error, and therefore empower the existence of this error. You should not set policies that simply make a "dissenting" group empowered.
There is no evidence that speech can be harmful.
More relevant sources of harm exist that have not been deemed necessary to limit.