Industrial action in response to sacked and suspended members. Nothing to do with the current dispute. If it was, then obviously, they were punished because of the industrial action, not for matters of discipline.
Isnt the problem here that both BASSA and the Unite leadership used this very issue as a reason both before and during the last strike. They have since cited it (and 2 other reasons) as a cause for a further ballot. BA quickly responded to this saying that they believed that these reasons were all a continuation of the existing dispute and anyone striking on those causes would be conducting unlawful industrial action.
No doubt should a ballot for strike action be made with these reasons they will reaffirm that message and act accordingly on day 1 of the strike. It is then for the now ex-employees to take BA to tribunal and prove that it was lawful action. Meanwhile everyone turns up on day 2.
Its not a game I'd want to be involved in.