Look, Theresa May picked up the poisoned chalice when nobody else wanted it. She was between a rock and a hard place (Government who was out to get her regardless and the EU who had been insulted by the Public vote that said OUT). If ever there was time for inter-Party squabbling to stop, this was it. As it was, each individual was out for their own personal gain. What should have happened is a cross-Party get-together, to oversee the UK leaving the EU. It's easy to place blame on May, but only she, and those who were involved, KNOW what she was up against.
For me, her only fault was not chucking it all back at Parliament, all of 'em, months ago and walking!!
If anybody should be targetted in all of this MESS, it's Mr. CamORON who allowed the Referendum to be held at all WITHOUT THE PUBLIC KNOWING ALL THE FACTS. Not leaving the situation to become media-led.
As for 'speech' - she's entled to say what she feels needs to be said before she leaves.