The SPDs record is anti-democratic, they used elections to legitimize themselves then unleashed paramilitaries to crush organized workers.

The elections hadn't happened yet. That's what the Spartacist uprising was trying to prevent - upcoming elections that they were not even barred from running in.

But tell me more about how the only response to an anti-democratic coup was to roll over and let the People's Fascists(tm) execute everyone and suppress democracy.

Revolutionary democracy is more than just fucking ballots and voting. The entire point is mass participation, self organization and ongoing struggle.

Curious that seems to so often be an excuse to disregard the clearly expressed will of the vast majority of the population. It turns out that your "Revolutionary democracy" actually means "A vanguardist clique whose conclusions are always referred to as the will of the people, no matter how many people actually express opposition".

The January uprising wasn’t a Bolshevik-style coup. It was a mass revolt sparked by SPD repression, which the KPD didn’t even plan

The KPD literally voted on the subject, lmao. Talk about ignorance - or willingly spreading lies. It's difficult to tell with fascists.

and which Luxemburg herself thought was premature.

Yes, Luxemburg herself thought it was a bad idea and voted against it. Luxemburg voted, in fact, to participate in the upcoming elections, which is, according to red fascists like you, bourgeois. Damn that neolib Luxemburg!

She was outvoted by the KPD leadership, which preferred a coup.

‘history major’

Yes, it is quite apparent that you, like so many other fascists, are 'tired of experts' getting in the way of your masturbatory totalitarian fantasies.