Because they don't. I read yesterday that this debt crisis will surely end up raising the cost of borrowing for the country. A 1% increase in the interest rate will cost us an additional trillion fucking dollars in interest payments. So when Boehner and Cantor and the rest of the Republican assholes say they are only interested in us "living within our means," they are lying through their teeth.
This is not about the deficit. This is about two things. One, is the Tea Party idiots who have taken a pretty decent democratic model and fucked it up. Turns out that democracy doesn't actually work well when one side doesn't believe in compromise or negotiation. And the Second is the conservative right's absolute hatred of any social safety net.
My Republican friends all tell me they support some safety net, they just want it under control. Well, they should really check with the sociopaths running their party, because the GOP would prefer that Grannie be left on the sidewalk when she can no longer afford her meds or rent.
Don't tell me they care about the deficit, and don't tell me that the GOP doesn't hate poor and working people.