No, because when police have a search warrant and storm your home, they can't seize the private conversation you had in bed with your partner a year earlier. They can't suck the memories out of your head. Technology like mobile phones and messaging have become an extension of us, they are used for private conversations and personal memories. Breaking encryption on these is not like search warrants of yesteryear, and not like wire taps. In traditional search warrant they would not be seizing communications. And in wire taps they would only get conversations going forward, not years in the past that they can search through, and even with conversations going forward they sometimes wouldn't be allowed to listen to personal conversations.

The Bill of Rights (first ten amendments to the constitution) is all about protecting us against abuses of government officials. It presumes people in government could be bad, and we need protecting from them. By allowing a government official to seize all our private conversations it could allow a bad government official to go fishing and find things things that they can use against their enemies. There are many, many laws. Many of them aren't enforced, but could be.

For example in some states adultery is illegal, even a felony in some states. Not just in small states, but in New York, Massachusetts, and Michigan. In Massachusetts there hasn't been an adultery conviction since 1983. But if law enforcement was allowed to decrypt an iPhone, and find private bedroom things, it could be used as an attack on a political enemy.

It isn't only "bad people" that should be worried about the government. I think pretty much everyone agrees Martin Luther King Jr. was a good person. But the government at the time didn't think so. When he was killed the first people on the scene were the police officers who were doing surveillance of him from across the street. That is the kind of government we need to be protected from.