One thing about direct action, strike, and other aggressive labor tactics is that you really don't want to go down that route half-assed. You have to be organized, mobilized and ready for 100% commitment. And you need a strategy that makes sense. How is this action going to lead to your desired result?
The Providence Teachers' Union is, at this point, completely demobilized. How they got to that point is a matter of discussion and debate. As is what to do next. However, there is good reason not to try to take action right now. They aren't ready, and timing isn't of the essence. And I don't think anything they would have done last week would have made a difference.