The Labour Movement grew from many and various roots. Trade union and co-operative. Radical Liberal and Tory populist. Christian Socialist and Social Catholic. Fabian and even, in the space both on Labour’s fringes and on Marxism’s fringes, Marxist, subject to the balancing and moderating influences of the others.
Marxism gives many of the wrong answers, but it asks many of the right questions. Giving the wrong answers does not preclude asking the right questions. Much of the Fabian tradition also gives the wrong answers.