(2) historically people simply did not create a huge written record (texts etc) detailing their crimes, so there’s no change in available information
(3) even before any of this tech police are not good a solving crimes, and generally rely on errors by criminals
(4) and finally. Your argument is definitionally the slippery slope and is the reason the 4th and 5th amendments exist in the US. Your argument is trivially extended to literally everything: why shouldn’t all communication be routed through government servers to find evidence of crimes? Why shouldn’t all device locations be available to police at all times? Why shouldn’t you have video and audio recorders in every home (most child abuse, the quintessential horror) is committed by family members in the home.
Having actual privacy does not result in crime, and mandating that privacy should be illegal in only a single case is clearly nonsense. Either you have a right to privacy or you don’t.
Imagine I’m planning something malicious. If I literally do anything other than talk about it, there’s going to be evidence, and that evidence won’t be encrypted.
Plus, crack-proof encryption existed at least back to Roman times - simply because making a secure code was fairly easy and we didn’t have codebreakers. We managed.
we don’t remove all rights to privacy for people in their homes because criminals use homes too. tech should be no different
Yes, giving people privacy means giving everyone privacy, whether they're doing good things or bad. Pointing cameras into everyone's window would also prevent some crimes, and we shouldn't do that either.
I don't think "This has tradeoffs but those tradeoffs are absolutely worth it" is a level of nuance that's possible in the face of the level of scaremongering against E2EE.