Industrial strike action is necessary. Some times, employers will become unreasonable and not give their employees the pay or the benefits that they deserve. In order to get these things, workers will some times go on a strike to prove that they are needed and that they need the benefits.
If workers are not being treated fairly or if working conditions are hazardous, a strike may be the only option workers have to get any relief or results. Industry-wide strikes can be an effective way to publicize worker grievances and a production shutdown cannot easily be ignored by management or by consumers.