Law enforcement officials don’t just want to be able to scan for CSAM. That’s the excuse to get the public to buy into mass surveillance. “It’s for the kids” is disingenuous. It’s not for the kids to them, it’s to open the door to the police, and anyone with some skill, to watch ALL of our communication and use it in any way they see fit.
Yes, that will include that cop who’s a little too friendly with the teens in the neighborhood, the one abusing his wife, or the one stalking an ex. It’ll also include officials with political leanings spying on opponents, dictators with unfettered access to all communication coming and going to their citizens, and hackers getting access to blackmail material.
All of it. Out there for anyone with the keys to see, store, and use as they see fit.
This is a good suggestion for those times when you feel the pressure to respond right away, don’t want to upset anyone, and just agree. It’s classic people-pleasing behavior. Far better to just give yourself a pause to make a better decision.