The union movement’s problem isn’t that workers don’t want to fight; it’s that they don’t want to lose.
You can’t ever really be ready for the class war, but much of the job of working-class strategy is to stage and escalate conflict at the most advantageous moments. So-called legacy unions represent living traditions with institutional memories of what worked and what didn’t against an individual boss, in a given industry, or among workers of particular types. It’s an error to perceive union defeat as evidence of some strategic mistake. American workers can do everything right and still lose.