Moon, I get the difference between boneheaded and aggressiveness, and I understand that you are talking about the boneheaded plays.
I still think that boneheaded plays can be caused by trying to do too much. Forgetting how many outs there are is not a case of trying to do too much. But trying to advance to 3rd on a ground ball hit in front of you certainly could be. If I'm not mistaken, you have called that a boneheaded play, to which I agree. My point is that I could see that play and some other boneheaded things being done by a player that is trying too hard to make something happen.