"Shooting" at own basket

[Raymond]

Originally Posted by just another ref

It's also legal if you consider it a try.

I'm missing the point of that. Everyone already knows you can rebound your own shot.

You told a poster in order for the play to be legal you need to consider McGrady's throw off the backboard "a try". Why does he need to consider it a try when it's perfectly legal to throw the ball off your own backboard and retrieve it? Why add judgment to a play that doesn't need judgment?