On the contrary. One of my side-projects is involved with the running an Internet-to-PSTN wake-up-call service. The service is free-to-use in the US (because domestic calling is so cheap) which also means it gets used by criminal-harassers who send wake-up calls at 4am to their targets (we do aggressively rate-limit which helps mitigate these issues). We are frequently contacted by local police departments across the country (we don't spoof our Caller ID) seeking information about who made the call (roughly 25% of the time we get a subpoena or court order) and almost always we see the call request came from an IP address hiding behind a simple PHP web proxy script or a Tor node.

While my story is an anecdote it does demonstrate that it is very easy to hide your identity online for quick hit-and-run harrassment - it's not that LE have abdicated - it's that they've done all they can do - because what can you do with an IP address allocated to Egypt?

While the issue I've described is a societal problem, it does have a technical solution: if the phone numbering system were redesigned so they worked more like email addresses then people could change their phone numbers or use disposable numbers and aliases which would put an immediate end to unwanted calls... but that's not going to happen.