Functional Ambivalent posted this a year ago and I linked to it then. It resonated with me again today as I reviewed past entries. You should still go read Tom’s whole post, but here’s the essence:
If you’re a libertarian and you vote Republican because you like lower taxes, you’re empowering people who would ban books, set up a huge federal broadcast censorship aparatus, give the President the power to arrest and imprison without evidence or appeal, and empower everyone in the medical supply chain to decide who gets treatment based on their own standard of moral worthiness. You’re almost literally selling your freedoms for a few dollars in after-tax income. That’s what you vote for every time you vote Republican.