[He will lecture a telepath about whatever he damned well pleases to lecture about because he's Batman, okay? It's written into his contract.]

There's no guarantee that they haven't been corrupted. Or that they're turtles at all. This creature has enough influence to make them seem so without the burden of reality.

[Whatever he's not going to argue he's obviously right about this.]

If it's a real infant turtle, I won't harm it.

[There's also the implication there that he really doesn't need permission, and that he's asking as a courtesy and little else.]