These acts, like the beheading have a negative effect on Muslim relations, yet you never hear a Muslims condemning these actions, rather they won't talk about it or they celebrate it.
I watched a Fox news reporter outside the guy's mosque this morning, the people there wouldn't answer any questions and said he would have to leave or the authorities would be called. Now that would of been a good time to condemn his actions, it looks like they support what he did.
Of course I will always have the images after 9/11 of Muslims world wide celebrating and burning the American flag, that didn't leave a very good impression with me.
These actions are no way to get on our good side, maybe it's true that they just hate us, that can work both ways.