Indirectly? Yes. They’re responsible for creating and upholding a declining status quo while suppressing all left-wing alternatives and not only allowing the right to run wild but also legitimizing them through concessions and appeasement.

Directly? Also yes, because they literally promoted Trump thinking he’d be easier to beat and that they could more easily sell themselves as the “lesser evil” and coerce voters into coming out if they were up against him (which they’ve also done with other far-right candidates).

Literally any scale, any perspective you want to use, they deserve plenty of blame.