Kindness and fairness entail not applying force to prevent someone from expressing their views. No one wants to be silenced by censorship, so we should not forbid anyone from freely expressing their views. This is true even when we strongly disagree or dislike those views.
Of course, if someone is exploiting this freedom of speech to establish a tyrannical government, based on an extremist ideology, which would violently silence anyone who dissents from its official dogma, this speech is not protected by the free speech principle. This does not necessarily mean that the person should be silenced. Sometimes it is actually useful to let him express his views, so that everyone who supports free speech and toleration would know about this person’s true beliefs and intents and act with appropriate caution when dealing with him. However, if that person is gaining success in influencing susceptible people to accept anti-Povism views, then the self-protection principle of Povism, which has higher precedence over free speech, necessitates applying force to disperse this activity on the grounds of self-defense. Precise guidelines should be laid out to handle such situations.