Mr, in democratic societies voicing your views is protected by the freedom of speech. However hate speech and extremist groups preaching it should be prosecuted

Mr, in democratic societies voicing your views is protected by the freedom of speech. However hate speech and extremist groups preaching it should be prosecuted, as criminal organizations. A Jewish philosopher has advocated for this stance (whose name I've forgotten). Are you a sympathizer of this group by any chance? Why do you think it would be beneficial for a person living in a Western country being subjected to extreme violence, intolerance and hate speech?