Game of thrones question! Season 3 ep 5?

In the latest episode 'kissed by fire' Jaimie talks to Brienne in the bath tub about killing the mad king..Im confused as to why it's implied that Ned stark was disappointed in Jaimie for killing the mad king? Shouldn't he be happy since he was horrible and kidnapped his sister? Why was Jaimie so... show more In the latest episode 'kissed by fire' Jaimie talks to Brienne in the bath tub about killing the mad king..Im confused as to why it's implied that Ned stark was disappointed in Jaimie for killing the mad king? Shouldn't he be happy since he was horrible and kidnapped his sister? Why was Jaimie so upset about it? Wasn't it a good thing he did, why should his action be questioned? I think I'm missing something
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