No, that is wrong. It is the purpose of the laws to protect privacy, which is our right to protect ourselves by prevention of sharing sensitive information with bad actors. Our privacy means that others cannot exploit our weaknesses to get our money or to bully us. It means that rogue cop cannot blackmail us by exposing details of our private life to public. There are many scenarios when too much data landed in the wrong hands.
People may use privacy as an excuse to hide their crimes, but criminals are minority and lawful citizens will be exposed to criminals and police states if privacy shield no longer exists.
As for child abuse, when we have to seek for evidence, the crime has already happened. Solving it is important, but what is more important than that? Prevention.
It's not just a few bad cops. No matter how well the law is written and executed, it is always bad from the point of view of some people. There is no universal agreement about what should be illegal. People who lose the fight over laws can use privacy as a refuge.
People may use privacy as an excuse to hide their crimes, but criminals are minority and lawful citizens will be exposed to criminals and police states if privacy shield no longer exists. As for child abuse, when we have to seek for evidence, the crime has already happened. Solving it is important, but what is more important than that? Prevention.