I cannot speak for all Libertarians; but, as for me, I see extremism in a 40-year War on Drugs that has failed miserably when a better program would be to decriminalize petty products like pot and tax the hell out of its sale; then use the income to treat and educate the users of hard drugs. I see extremism as the left not understanding that there is a point of no return in pregnancy (somewhere in the mid second trimester when "quickening" occurs). I see extremism on the Right as not understanding that some unfortunate people are burdened with a same sex proclivity from birth and that they should be allowed the same advantage that traditional man-woman unions have, however, that advantage cannot be called marriage in that it doesn't follow the looks like, acts like, quacks like duck logic. I see extremism as an abuse of power by both parties when it comes to confiscatory taxation of the citizenry when a flat tax is the fairest tax. I see extremism in welfare, whether it is individual, corporate or disquised as foreign aid.
Libertarians (at least in my case) strongly believe in the right to ownership of firearms, in free trade (and neither CAFTA or NAFTA meets that definition), in free borders (but where non-citizen migrants do not have the benefit of free education, health care or social service programs), in the freedom to exercise religious preferences anywhere or anytime, in private charity to replace all government handouts, in a war only when Congress declares it, in private property rights with certain limitations on what is in community standards of good taste and is not harmful to neighbors, in the marketplace to solve labor issues and establish wage earnings, in tough, truth in sentencing punishment for violators of law, and most of all in freedom. Succinctly, I would love to have Republicans out of our bedrooms, Democrats out of our wallets, and BOTH OF THEM OUT OF OUR CONSTITUTION!!!!