I don't think we can underscore enough the fact that the use of replacement workers undermines the collective bargaining process. Very bluntly, it pits worker against worker. I don't necessarily agree that at the bargaining table we're equal. The fact of the matter is that the employer pulls the purse strings. They have the money.
What we have is our labour as workers. That is our power. We don't have the money. If we cannot exercise the withdrawal of our labour, do so safely and have an impact on the employer, then it is a meaningless right.
In that situation, you create resentment and anger. You create a scenario where, once again, you are pitting human beings against each other. Everybody wants to make a living, and the striking workers are not making their living. Watching someone else come in and take their job is not an acceptable solution.