The people of KL have been shown lashing out against Joffrey for being a vicious, uncaring asshole - which guess what, he was
They have been shown lashing out against Cersei for being an entitled, incestous bitch - which guess what, she was
They have been shown trying to seek shelter from Daenerys and her Dothraki and Northman army - entirely justified, as it turns out
They have been shown to love Queen Margaery - which she was deserving of
The one thing you can blame them for is cheering for the death of Ned Stark - if you disregard the fact that they had absolutely no way of knowing what we, the audience, know and were deceived by the machinations of House Lannister and Littlefinger. For all they knew, they were witnessing the death of a traitor who had endangered the rightful king.