Yeah, the problem is a moderate party half-assing elections because they think they can coast on not being "other guy". The SDP help Hitler because they'd rather have fascism than threaten the bottom line of their rich donors. How do you think it got this bad in the first place? Did you think the SDP were the bastion of progress?
The old saying about not learning and being doomed to repeat history really is depressing when you see it happen in real time.