system
Given the following post, respond as if you're commenting on Reddit:
human
[GOT] "They are dragons, Khaleesi, they can never be tamed" But somehow they can be ridden?

Title pretty much says it all. 

I'm just a show-watcher (grad student, no time for reading the books), and up until recently, been imagining Dany and her nuclear dinosaurs returning to Westeros and burning/eating certain vile assholes alive. 

The problem I have: Ser Jorah keeps telling Dany that dragons can never be tamed, but we KNOW that Targaryans (sp?) used to ride them into battle AND keep them just chilling around the Red Keep, which sounds pretty tame to me. How do these two things reconcile with each other?
gpt
They can be trained, but not tamed.  Like a lion or a wolf, you can teach it to follow commands but you can not truly know its heart.  It will never be a dependable companion like the family dog.  

Also, Jorah Mormont may not know jack shit.  He's not really the most authoritative source on anything except for current events... Westeros Weekly sort of stuff.  He is highborn and educated, but he doesn't know any more about dragons than any other nobleman.