If you read the post properly, the point wasn't to 'upset the bosses'.
What it has done is stolen the moral high ground from the bosses. Bosses will always talk about the greed of a relatively well paid workforce (e.g. ATCO's).
This action may well have taken the managements option of using the media to taint public opinion away from them.
At the end of the day, it could be a very clever move - and it's certainly proved to management that the ATCOs are united - can anyone in the UK see NATS ATCOs having the balls and unity to stand togeter like that?
Thought not.