I see the need of the police to access personal communication to fight child abuse. However, if the police can access it, then so can NSA, China, Mafia, and ran

I see the need of the police to access personal communication to fight child abuse. However, if the police can access it, then so can NSA, China, Mafia, and random hackers. A backdoor is not restricted for long. I consider this risk higher than child pornography.