Because every proposed program is intended to be funded with debt without any expected ROI?
Conservatives (and even republicans!) have a philosophical opposition to social programs that are administered by the government because the government creates bureaucracy and inefficiency that privatization would have an incentive to avoid. So there's a knee jerk there, sure.
But more importantly, these are bad ideas, that often perpetuate underlying social issues that cause these systemic issues. Barney Frank's bullshit idea that every American should own a home created a market for mortgage derivatives that didn't have the safeguards in place to prevent a bubble. Social Security is a Ponzi scheme sustainable only if the population and economy grow perpetually in lockstep with stable unemployment and life-expectancy-after-retirement. Universal Healthcare would relieve of a lot of families of a major stressor--and instead burden every family with paying existing entitlements for significantly longer periods than they were ever intended.
I mean, there's actually a handful of social programs I fully support and would even be willing to debt finance. Public and/or subsidized preschool/daycare for all children is one. I also support an FDIC-equivalent for owners of futures contracts in the wake of MF Global. But there are also hundreds of programs that we can cut outright, defund, or otherwise privatize.
My issue with your statement is that the opinion of much of the left is that "Bush got to do what he wanted with the national debt, now we should get our turn" and the opinion of the right is a more unilateral "we need to fix the present issues with the national debt, and few of these proposals will do that." Obama, for what it's worth, has given up on the former (ie, most of his campaign message), and rightfully so. I'm not saying that both sides aren't playing political chicken with the national debt, or that Republicans would be more receptive to these programs if we weren't in the midst of a revolving debt crisis, but again--this is the right thing for right now.
The government and individuals have to get fiscally conservative if either plans to avoid catastrophic repetition. If you don't recognize this, you are a Nancy Pelosi-scale moron; if you attribute this to political extremism slanting the landscape republican, you're not viewing the situation from a meaningfully close enough perspective.