Destroy? - Never... They are are part, a cause and an effect of our freedom. I always disagree with that kind of talk. They are the balance and the catalyst and the inspiration for what we believe. They are the ying for our yang. Politics is and must be a pendulum swing. There must be a force that tends to pull the pendulum back through center once in a while, or either side unopposed would become tyranny. Think of them as gravity. They just are.
I know that there can be no dark without light, beauty without ugliness (yin and yang). What I meant, though, is that if the Left succeeds in imposing socialism, then our freedom will have been destroyed, as socialism does not allow for freedom.
I view "our side" as being very much like the government of the Shire, that is to say, almost no government. I don't suppose too much of almost no government could become tyranny. I do admit that there are philosophies within the "right" that could evolve into tyranny.