It's not just random postal workers doing it though, it's union members doing it as part of a sympathy strike. And surely every workers "duty" is their job, so

It's not just random postal workers doing it though, it's union members doing it as part of a sympathy strike. And surely every workers "duty" is their job, so then no striking should be allowed? Or should only complete strikes be allowed? Union members should be allowed to go on strike, complete or partial as far as I'm concerned.