Even Lenin was of agreement that left unity was overrated. He talked on a preference of a “unity of Marxists” over a "unity between Marxists and falsifiers of Marxism.”

Speaking more personally, I’m willing to unite with others on a shared common basis and a common program. But there are limits. I do not seek unity with Maoists and Stalinists and their armed struggle because history has shown that even before they have taken power, they already murdered hundreds of their own dedicated communists thirty years ago. The Communist Party of the Philippines has consistently refused to account for this atrocity. Then twenty years ago, they murdered Marxist-Leninists and social democrats. What kind of unity can be had with a group that murders their own cadre and the cadres of other groups? The answer is that there can be no such unity.