The fact that he takes the shot, win or lose, make or miss, is the point. Clutch is just as much about taking the shot as making it. LeBron does not demand the ball, it's one thing to have the ball and pass to a wide open teammate ala MJ, it's quite another to not even get the ball in your hands in "clutch time" ala LeBron.
No, WOW, as I pointed out, plenty of guys in the NBA have taken those last second shots and made them; and as my examples show, they come from a variety of players. So far, LeBron James is not one of them, but that isn't relevant yet, as he is still a babe in the NBA and not all aspects of the pro game have yet manifested themselves in his game.
Yet you seem to think that, because he is LeBron James, he should be demanding the ball late in games to show his cajones. I think he just should play smart. Teams are likely to focus on him more, just like Bryant. The difference, and this is where I totally disagree with you, is that LeBron has absolutely no interest in being the 'clutch' shooter late in the game if the game dictates another player try the shot because he is more open. That concept is as foreign to Kobe Bryant as peace in our time.
Bryant simply insists...to all the world, I might add... to be that late game clutch shooter. and as Joe pointed out, eventually his teammates will get wise to that fact and God help the Lakers if five guys swarm over Kobe with three seconds left and he actually has to pass it away. That would look ugly.