Was it a good idea to leave Charles Wallace on Camazotz?

The
answer to this is complex, because Meg's father is forced to choose between two of his children.
Meg is in danger of IT taking control of her mind, but Charles Wallace has already been taken
control of. Therefore, Meg's father has to make a quick decision about what is best for the
safety of all involved. In this case, that decision is to tesser to another planet with Calvin
and Meg while leaving Charles Wallace behind, even though he is still under the control of IT on
Camazotz.

Ultimately, however, this does prove to be a worthwhile decision.
While...