Because it isn't about CSAM, IMO. You see this with plenty of social issues, notably firearms ownership. The claim is we will restrict/license/outlaw xyz for the kids, but really, a data-drive approach would have focused on different things entirely (eg additional behavioral health services for kids, suicide prevention etc)

The same technology/access used for CSAM identification can find copyrighted files, materials that don't support current government, etc. Full E2E encryption seriously raises the cost of mass surveillance, and why the US government fights it at every turn going back 30 years.

> The claim is we will restrict/license/outlaw xyz for the kids, but really, a data-drive approach would have focused on different things entirely (eg additional behavioral health services for kids, suicide prevention etc)

Well, most of Europe simply has banned guns in the hands of civilians instead, so that's some data as well.

The only reason why the US is so extremely lax on firearms is because people keep blathering on about how guns are the last line of defense against a tyrannical government - and yet, what do the most rabid of these people do? Vote in and defend a literal tyrant.