I don't think the people I'm hearing who are anger out Obama's demeanor are thinking in terms of politics. They're angry that he didn't appear to honor the wounded and dead military people; and I think their anger on behalf of those wounded and dead is, in its own way, a wish to honor them.
Some people's instinct is to light candles to honor victims. Others is to speak up about what they perceive as lack of respect for the victims. I think a lot of people are concerned that there's the possibility this was an act of terrorism within the military base. Not to disregard the victims by any means, but if it was an act against the US military from within that brings a whole, separate, set of concerns that become a concern for everyone. The way I see it, better to address the concerns than to act as if there's no possibility they could be valid. That, too, in its own way is also honoring the victims.