Would you also be ok with not being allowed to send any mail unless you first scan the contents of everything in that envelope and include a generated signature that might tell the post office that you're sending CSAM? And then having the envelope delivered directly to police if the scan did indicate that?
And let's not pretend there are not already many other ways in which child abuse is detected and fought. When schoolteachers or doctors or neighbors or other family members notice something is amiss, when a CSAM group is infiltrated by police, or when a predator falls for a honeypot. This triggers an investigation, and at that point no digital lock can withstand modern targeted covert surveillance. But we are supposed to pretend none of this exists, and that encryption is an unassailable castle, and play along with the "going dark" lie, despite being more surveilled than at literally any point in history, including under the Stasi.
They only don't address child abuse, if by "child abuse" is meant a photo existing in some private shared-with-nobody hard drive, and not an actual human child being abused.