Taking the current kerfuffle over funding DHS as an example, debates over this sort of thing generally center on the foolishness/stubbornness/futility of Republicans for demanding things unacceptable to the Democrats in Congress be included in the bills needing passage. Such debates include Republicans decrying their party’s foolishness/stubbornness/futility.

Yet these debates never discuss Democrat foolishness/stubbornness/futility for demanding things unacceptable to Republicans be included.

This brings me to my question: on what basis is the Democrat position taken ipso facto to be the correct/default position, and the Republican position taken ipso facto to be wrong?