If BigCorp meets with me under NDA and says "We are going to firebomb you all" then I can't say without personal legal repercussions "BigCorp is going to firebomb us". But I can say to everyone "Let's invest in some fire suppressant. If you think about it it's only a matter of time before we are firebombed."
The alternative is stay ignorant and then simply get firebombed
@darius If BigCorp offers you a meeting, there has to be something they're getting out of it. And you can force them to drop the NDA if they want to get that.