There are other ways to capture and ensnare criminals. Sacrificing our privacy for the "greater good" is a bridge too far.
As one counter point, think about all of the completely fine human behaviors that instantly become kompromat when the powers have access to your every communication. That is way more dangerous to democracy, freedom, and liberty than a slightly smaller chance of "not protecting the children".
Besides, if we actually cared so much about children, we wouldn't let them not get school lunches, we wouldn't sell them on gambling and gacha games, and we'd do a much better job of educating them.
