Why did the socialists tolerate the bolshevik coup?

Answer 1

They tolerated the Bolshevik coup because they misunderstood the Bolshevik's true intentions and underestimated the ability of the Bolshevik's to retain the power they had usurped.

The various socialist parties were actually opposed to the Bolshevik takeover; however they tolerated it because they felt that it was better to accept a takeover by a socialist party than to invite civil war that might undo the gains of the revolution or even restore the Tsar. The socialist were fooled into thinking that the Bolsheviks truly intended to honor the principles of the revolution and give power to the Soviet councils or to the people themselves. They did not realize that Lenin and the Bolsheviks had no intention of allowing anyone other than themselves to exercise any type of political power.

The socialists also found themselves with no power to resist the Bolsheviks as they consolidated their power. The Bolsheviks had created the Military Revolutionary Committee, which was an armed force. The soldiers of the Russian army for the most part refused to intervene.