Just want to point out that nobody knows the robots are sentient. As far as anybody on the outside is concerned, Ford probably programmed them to do this in some murder suicide type rampage. He could very well be seen as just a lone shooter, so to speak.
Also, there is a lot of motivation for those who survive the attack, either on the island or off, to keep this hush hush until they are able to get it under control and mitigate the damages. Those board members who were killed are going to have family that stand to inherit a lot of money from the stock in Westworld, so long as the military doesn't swoop in and level the place or shut it down.
We don't even know what country this is in, or even if it is it's own sovereign nation. We don't even know what countries are left in the future, for that matter.
Point is, it ain't like this is going to be broadcasted on the six o'clock news and everybody is going to know about it. As of right now, the only victims of the rampage are board members and Westworld personnel. They may go after regular guests, but then again they may not. If they don't, then I suspect we will see the survivors like MIB, board member lady, and writer guy work to cover it up.