Thing is, Lenin and Mao agreed with you about the need and usefullness of pushing for and providing alternative economic and social organizational structures like co-ops as part of a revolutionary movement and building of socialism, or of just its foundations. They actualy did so in scales and revolutionary character not dreamed of even by the most ambitious demsoc. The point and their point would be that it can be a part of building socialism and historicaly has been so ONLY when persued and enacted by a well organized non reformist revolutionary movement . Co-ops are cool but to actualy be a part of a move towards socialism they must be part of a larger revolutionary project and connected with the work or actual revolutionary socialist orgs.

You think Mao aand even Lenin werent alive to see socdem/demsoc politicians with more radical agendas than corbyn and who campaigned on all shorts of co-op , nationalizing etc etc ? They saw them win and rule actualy, they had them in their own countries as well. They wouldnt tell you to not vote for Corbyn in todays context in the UK but they would laugh at the idea that the their agenda and party in power can catalyse any move towards socialism or spreading of class conciousness or that if their campaigns were shot down that meant that capital viewed them as a existential threat. And its not the specific policies of their agendas , like nationalizations or promotion of co-ops , that cant have that character and use, they CAN and Lenin and Mao used them more extensively than any politican in history lmao.

So yeah you do need to in some large degree follow the lead of Lenin and Mao and emulate the character of their movements in order to make those things and policies in Corbyns agenda be important revolutionary stepping stones to socialism and a threat to capital. Until then they arent and they never were despite dozens of chances that they had to prove otherwise . If a successfull non reformist revolutionary movement is impossible in America or the UK then its impossible for those policies to be a an actual threat to capital and to be the foundations of a socialist transformation