Yet you still get "democrats" who lower taxes, start wars, and restrict liberty. Yet you still get "republicans" who raise taxes, increase the size of government, and create social programs. If you have blue visible light and mix it with red visible light, is it still called "red" or "blue"? Or is there a different name for it? Because it sure as hell isn't still blue.
If you mix a little red in with a little blue, you start shifting it out of "blue", but it's not abruptly "not blue".
No significant political party or other large group in history has ever demanded perfect adherence by all members to all aspects of platform or ideology, that doesn't mean the groups didn't exist.
I'm also not sure where you get the idea that lowering taxes is not a Democratic thing, or creating social programs is not a Republican thing. It sounds like you're getting your ideas of what the parties stand for solely from the loud-mouthed extremists.
The world is nuanced, that doesn't mean identifiable groups do not exist.
