Re: SPOILER *all five books* THREAD FOR Game of Thrones (TV series discussion)
Tywin totally destroyed two Houses. Stark and Reyne. Stark could come back, but as far as most characters in the book know, he totally decimated the Starks. Not saying it takes a genius to do this, but yeah Tywin is sharper than most. Tywin did get a fortunate break when Ramsay sacked Winterfell, but Tywin finished them off.
I just used Tywin as an example earlier of an intelligent character that was killed (hope everyone realized i was being sarcastic by calling him dumb). It was his scheming that did him in too (as well as a crossbow bolt).
Doran also couldn't know Dany is a fool or insane. Most rational people in her position would love to have an ally in Westeros before they invade. Not Dany though.