No, I'm European, from a country with strong unions. I always thought that the right to strike makes sense if both sides need to invest in the struggle- if one

No, I'm European, from a country with strong unions. I always thought that the right to strike makes sense if both sides need to invest in the struggle- if one of the parties can inflict damage on the other with no cost for itself, what prevents it from advancing completely unreasonable demands? "Their innate reasonableness and common sense" is not a satisfying answer, as any power that can be abused will eventually be abused.