u/AV23UTB

Ned didn't want a bounty on Dany because she was just a child. Robert didn't want to sit around and let a Targaryen rule over a Dothraki army. So why not put a bounty on Khal Drogo? He definitely wasn't innocent, so Ned would be happy. And it would mean the Khalasar would no longer have any desires on Westeros, so Dany lives out her days in Vaes Dothrak, posing no threat to Robert's rule.