You got me. I cannot stand Obama's arrogant politics.
But, to the main point, I do not think government, whoever is in power, right, left, independent, should use the tax code to steer behavior. Do you like having others choose what behavior is good (aside from that which encroaches upon other people's right to live a free life)? Suppose, for example, that those in power decided that single parenthood was good, low education was good, a lot of government support allowing people to choose to not work was good. Would you support tax incentives towards those goals? You are implicitly assuming, in my view, that politicians work towards goals that are objectively sound. I trust them as far as I can throw them. You should, too.
I've been on the defensive in this argument. You tell me why the government should encourage home ownership, marriage, having children. Why are these, objectively, "good" goals (the answer is they are not......not poor goals either).
And, don't be fooled by the idea of a democratic republic. Politicians often vote/do how they choose after they are elected and look towards being re-elected (i.e. local concerns) regardless of what makes sense for the country. Look at Harry Reid. We have someone from Nevada, a not too populous state, steering a lot of policy. Senators - 6 years! Do you really feel that your view is represented? Take away what they can decide and the limits do not matter nearly as much. But, the federal govt has become too big. Not just Uncle Sam, but Mommy and Daddy Sam.
The difference b/n our two viewpoints is simply that you are fairly willing to let others decide what is right. For the most part, I'd expect Mustachians to be for small government.