If I wrong - can someone please correct me. But my understanding is the actors could have striked for example two days a week - keeping productions (and other associated businesses) operational for three days a week until they reached an agreement. But instead they have decided to go on a full strike and so now all the other professions related to the film industry are suddenly losing their jobs as production companies stand these other film related professions down. It’s very common in the industry to be on contracts associated with each film - the film stops working completely so the other industries stop working completely. By this I mean camera technicians, make up and hair artists, runners etc etc.
IABU - I think it’s ok for the actors to go on a full strike and the fact other related professions are losing their jobs is a necessary consequence.
IANBU - sure the actors can protest and strike but could have chosen an option where the other professions working on their set did not lose their jobs as a consequence.