There is an assumption that the point of a protest is to "raise awareness" and "bring people over to your side". Some protests are like that, but certainly not all and maybe not even most.
Sometimes you do a march or a walkout to raise awareness for an issue or just to let people know that your movement exists.
But a labor strike is not there to "raise awareness". The primary purpose of a strike is to harm the company so that they give into a list of demands