One of my mates works for Royal Mail and most people in his office dont even know why they are striking so they are just spending the days off and at home doing whatever they want....
What do you expect them to do? Go on strike and turn up to work? Not everyone can fit in nor wants to attend a picket.
That clearly shows either a lack of understanding of the business your friend works in, or poor communication from the CWU as to why it balloted its members to take industrial action.