Are Republican Party policies the root cause of nearly all of our problems?

[Mercenary]

No, nor is liberalism
The cause of our problems are many different things.
You seem to think the worst fringes of some group or philosophy represent a group.
Social conservatism isnt even, although some elements within it do have bad ideas.
Same is true of social liberalism.

If banks and corps werent so close with government to begin with it is unlikely theyd have grown so powerful and their failure had such an impact. If thwy knew theyd be wiped out instead if bailed out perhaps they wouldnt have made such stupid decisions. If people were held responsible for their decisions a lot of things may have bee averted. I am not sure how the financial meltdowm is the result of conservative policies, it seems to be the result of twisted corporatist policies where government and big business operate as one.

I think the major causes of our problems is government being in bed with big business and people not really seeming to care as evidenced by their voting patterns or lack of voting.
Voting R or D basically is a seal of approval for corporatism.