Bunting to move a runner already in scoring position over when you need three runs is probably not a good use of one of only six remaining outs. But I completely agree with your second theory about making a move for the sake of making a move, and it's definitely not just Gardy. Time and again it seems managers will call for a sac or steal when the out is more valuable, bring in a pinch runner or hitter who is only a tiny bit better, or make a pitching change that gives the platoon advantage yet is a net wash. Why? Out of the perfectly understandable desire to 'do something'. The feeling is that if you're not making moves, you're not really managing, you're just watching the game from a really awesome seat. Nothing could be further from the truth, but it's easy to see how it can happen.