Libertarianism - "A System" Anarchist Mutualism - "An Ethic?"

I've been struggling recently with two, seemingly contradictory, idealogical impulses. One is a libertarian impulse to let people freely organize and exchange goods and services as they will with minimal government intervention. The other is the impulse toward mutual benefit through collective organization and the benefits of sharing mutual risks and benefits respectively. It occurred to me that these could be considered as not as mutually exclusive as a might have once thought. If you viewed libertarianism as a system in which people operate, and mutualism as an ethic by which people operate, than they are not necessarily exclusive.