Nope. Elthina's a criminally negligent cow who, as Meredith's direct superior, is entirely responsible for the deteriorating situation in Kirkwall.
If I had my way, she would've been made to suffer as the people of Kirkwall suffered under her grossly inadequate care.
Elthina neutrality was really problematic, she was at fault yes. There were problems with how Meredith and Orsino rule their groups. She believed that she could be the living Maker and let the mortals play it all, without consequences. As the supreme ruler of both parties, it is irresponsible to let things deteriorate.
Off course this does not mean Anders is a saint, he is a freedom fighter and he did what he believe would force their hand more quickly. Which is something that would happen whatever Anders planted the bomb or not but he is still a criminal just like Elthina, there is no moral ambiguity there.