All good actors are very bright. You can't be stupid and a good actor. You may be inarticulate, you may not be highly educated, but all good actors are quick-witted, some of them dazzlingly so. All you do is guide them.
It's hard enough to get any movie made, and when you take on these tough genres - and I've done it a couple times - it just makes the whole struggle more.
People have given me classified information, but always with the disclaimer 'This can never end up in a book.' And it never does.