Yes, we should be willing to accept a certain level of crime if it means privacy and security for hundreds of millions of regular people. Even more so when their cure is worse than the disease.
I think there's some confusion and people talking past each other there.
With a warrant, LE can extract messages from devices, request and receive data dumps from service providers, and attempt to crack encrypted data. In many places they can also insert backdoors (server or client side) with a warrant. We see some people pointing this out as being sufficient.
This is different from every device and citizen (except politicians) preemtively having their devices backdoored with access granted after a warrant (which you seem to be arguing for). Most of us agree that this is unacceptable and is already unconstitutional in several EU countries.
Currently there is simply no capacity for warrants to be seriously vetted. Hence they become arbitrary.