After Curiosity Core, Wheatley just fell silent and watched. There was no mumbling, no yelling, no trying to stop Chelldon -- he literally could not, the effects of that perfume simply wouldn't let him go against Chelldon's wishes and in a way, he even rationalized it.

Everyone had to go sometimes. Even very small, very cheerful cores that had hurt no one.

Seemed about right. Seemed about fair.

And GLaDOS was trying to kill them. Forced Chelldon's hand--

Though while Wheatley was a moron, he did care. He really did. This was just awful.