[quote="dsaxton. That is, what you mean by, "He might fold a better hand or call with something worse," is, "I have no idea why I'm making this play."[/quote]

This is completely incorrect.
Your line of thinking is incorrect.

Lukie knows exactly why he made this play: he thought the EV of pushing, which may induce a mistake two ways, and the added value of metagame for future hands, was greater than 0 (checking and folding). If we held 34s here, your argument is that its better to bluff with this than with AJ because we know why we are making the play. Now, there's only one way the opponent can make a mistake, and the mistake has exactly the same value as before. Also, this does less for metagame because he likely already considered 34s/74s to be part of your range in some way. Thus, pushing with AJ is uniformly better than pushing with air.