While I understand what you are saying in practice it means voting for and backing up a liberal party even if it’s a means to an end. People push anarchists to work with MLs and with liberals for the same reasons. Mainly that it’s a form of harm reduction until an actual revolution can take place. The entryism into labour wasn’t done instead of a revolution. It was meant to get policies that support the working class in place until such a time as a real revolution could be enacted which obviously takes time.