This isn't a MSM thing, but common sense. He's an unelected private citizen with a major conflict of interest getting access to our sensitive personal data. Whether he's sifting through it personally at this moment is irrelevant. He now has it. That's a major problem.
And speaking of trusting the MSM, why should any of us trust anything Musk says? He has a long history of lying and spreading false information. I'd much rather have someone with nothing to gain and a history of honesty leading this exercise.