Should governments tolerate the actions of dissident groups?

When debating the question, "Should governments tolerate the actions of dissident groups?" there are several points of view to consider. First you have to consider the view of the government. There are two possible points of view that apply here: the view of a democratic government, and the view of a dictatorship. Another point of view to consider is that of the people of the nation. Third, and finally, you have the point of view …

…suppressing the harmful activity. Also (this just occurred to me), governments have a duty to take pre-emptive action against dissident groups that are conspiring to commit illegal acts, if the government has sufficient evidence (non-manufactured as some dictatorships try to use) to believe so. Peaceful dissident actions should be shown tolerance, if only for the betterment of the country. It is for these reasons that I believe governments should tolerate the actions of dissident groups.