You’re exactly right about the threat of homosexual marriage. Liberals will create a bigger government to force gay marriage down the throats of conservative and religious Americans. Gay marriage will crush our churches, not expand our rights.
I think that many libertarians have the correct view about the limited role of the government but they have not spent enough time truly analyzing the positions they take and whether those positions will cause more or less government. This is espescially true if they derive those positions from the Libertarian Party.