Finally, somebody had the wherewithal to sit down with Bran and have a nice chat. Granted it was too upsetting for his siblings to do so. And Bran is still processes thousands of years of info. He has talked to Sam, but Sam was a little weirded out by the experience too.
Now Tyron's "fall from grace" is due to the fact that his family is his Achilles heel. He had 3 members of his family that loathe him. And at least 1 member tried to kill him in almost every season.
In order to emotionally survive his family and maintain his sanity he has needed to keep blinders on. Hopefully, Bran told Tyrion that Bronn is on his way up with Tyein's cross bow.