You can't act much differently than they did. It was an armed uprising attempting to overthrow the government and introduce a communist dictatorship in Germany.

>Under the leadership of Ernst Thälmann from 1925 the party became thoroughly Stalinist and loyal to the leadership of the Soviet Union, and from 1928 it was largely controlled and funded by the Comintern in Moscow. Under Thälmann's leadership the party directed most of its attacks against the Social Democratic Party of Germany, which it regarded as its main adversary and referred to as "social fascists"; the KPD considered all other parties in the Weimar Republic to be "fascists".

https://en.wikipedia.org/wiki/Communist_Party_of_Germany

Sure, everything would've been fine had Germany just allied with Stalin who were murdering millions way before Hitler got going.