It's hard to discount any sector of workers militancy, even when their tactics and actions are, in different ways, detrimental to the wider class struggle. I think a lot of the refinery (and transportation, etc) workers have the best intentions- they just don't understand the potential harm their strikes and blockades are doing to the greater struggle. As the article notes, union called strikes or occupations or pickets etc of certain industries are used to turn the tide against a greater struggle, or other groups of workers; and that the only groups who are harmed by such actions are other workers, the unemployed, etc.

Though in the case of the French pension fight, it seems like such a move by the union bosses to turn opinion against the struggle and the workers would have been far more successful at the beginning of the movement, before it spread and grew. You'd think they would've learned that lesson from the example of the Greek workers in transportation, public service, utilities, oil, etc (who were also given general public support).