It seems that all true conservatives agree that restoring liberty entails limiting federal government. However, it seems Libertarians only focus on limiting fiscal issues when it should be obvious that fiscal and social issues must both be limited. As such I see Libertarians as conservative allies that come to the fight with one hand tied behind their back.
The Left makes moral social arguments to increase government and take more taxes; these are the arguments that need to be countered with a principled philosophy that addresses social issues head on. Sitting on the sidelines does nothing to oppose the Left on these issues.
I would add that what the Left promotes is death and failure and that the only way such is perpetuated is by taking from success to subsidize it and perpetuate it and THAT is why government is a necessity for the Left. The Left can not go it alone, they are parasites that employ government to provide hosts and subsidize their bankrupt enterprise.