IMHO I still haven't heard any good sound solid reason for going on strike, considering the disruption and massive cost incurred.

Lets face it, if you ask for a rise in a private company (notrun by the Gowvernment), it is normally based on performance and inflation (except for promotion of course). If you are told that you will get 3% rise, you either take it on the chin, or if you don't like it, you go find another job with hopefully more pay.