While the movie overall is great, Superman returns has to have the dumbest Lex Luthor of them all.

Not only does he not help to push humanity forward in the slightest, but his goal is to create a landmas of radioactive crystals.

Even if I assume he didn't know they were radioactive (That would still make him stoopid). what exact use do you expect to get from a huge crystal? Because if you think you're going to grow food in there, good fucking luck