It may well be that it is their only tool in your opinion but it is still their right to use it. I don't like the way they do business, I have no desire to be part of them but I still do accept that it is their right to strike. Of course, as Spiderman knew "with great power comes responsibility", and so, the consequences of that action is theirs as well. I never want to see the day when a group of employees with a legitimate grievance would not have a voice.
I don't support BASSA or even Amicus in this but I will defend the right to belong to a Union if you want.
I am not a Union member and my opinions are my own.