I see that 25 years later the IWW was using the same argument against the Council Communists:
“The IWW is therefore also an opponent of armed insurrection in the class struggle. It is convinced that it will never be a match for capital in military terms, which is why it leaves violence to the ruling class.”
I don’t think Fitzgerald was advocating either bloody revolution or armed insurrection but was simply making the point that the ruling class was likely to violently resist the socialist revolution. Hence the need to gain control of the armed forces, to stop them being used against the workers and to suppress any “slaveholders revolt” by the capitalist class. Any violence would come from them not us.
Actually, both the SPGB and Council
Communists were making the same basic point against the IWW — that the workers can’t ignore the state and simply take and hold the means of production through industrial unions.