I'm about to start working in Spain and the right wing parties are suggesting organizing a general strike to prevent the social democrats from getting into office again. If this sounds ridiculous it's because it is, as the strike would not benefit (and in fact would hurt) workers. There is therefore a very small chance of it happening. It's also not clear if the strike would involve only union workplaces or all of them.
Hypothetically though, would the moral thing to do be to scab?