If only these issues were as clear-cut as you seem to think they are.
There is plenty of evidence that the risky loans associated with the home mortgage crisis were motivated by federal policies advocated by Democrats such as the implicit guarantees associated with Fannie Mae and Freddie Mac.
The student loan debacle is another example of unintended consequences of government loan subsidies and there is considerable evidence that those subsidies are simply captured by the colleges and universities when they raise their rates.
Regarding defense spending, it isn't a surprise that the US spends lots of defense since the US basically provides a national defense capability for itself and most of its close allies. There is certainly plenty of ways to be more efficient on defense spending but Congressional support for inefficient defense spending is hardly a Republican phenomena. It is a systemic problem.
Anyone who thinks that the ACA is the be-all-and-end-all of healthcare systems is delusional. It is a bureaucratic nightmare riddled with stupid incentives, accounting flim-flam, and ridiculous complexity. Add to that the completely reasonable thought that the more appropriate location for these services, if they are going to be provided, is the states.
Immigration reform: Unending posturing from Democrats who seem to want no limits to immigration and Republicans who seem to want no immigration at all. On top of that, I don't think the public knows what it wants (i.e. no real grassroots consensus)
Abortion: I'm not going there other than to say neither Republicans nor Democrats are uniform in their opinions on this topic.
My basic philosophy is that neither party is acquitting itself with much distinction these days. It is foolish to think that the flaws in our public policy are the fault of either party alone -- they are both complicit.