That’s a very reasonable response, and I’m not sure how to put into words the reasons I disagree.
I think i would say that while privacy is important and should be valued, I believe that protecting against the harm that individuals can do with tools such as this one is a greater good for society than the harm caused by ensuring that tools such as these are not allowed.
But how would you do this if you can’t see in the files?
Edit: Ah, I see, if they gave you the password.
Edit 2: You might want to look at local laws. In many places, ‘checking’ to see if there is CSAM is still considered viewing CSAM.