And even if you luck out and don't get "doxed" as part of the arrest, you will be outed as soon as your formally charged.
So, no, at least in the US, privacy is not retained until conviction.
Even if not charged with a crime, if you do something shitty-but-legal and someone gets a video of it, you're not going to get control over that viral video.
Not in the US. I can pull out my local newspaper right now and see a list of everyone who was arrested last week; long before they will be convicted of anything if they're convicted at all. For a lot of them they probably won't even be accused of anything because the other party won't press charges.
Journalists naming people as part of their work is a third category, and probably the one this falls under. It's dangerous territory, and Krebs stands to lose a lot (i.e. credibility, lawsuits, possible reprisals) by making this allegation if it turns out he didn't do his job right.
The same reason why it’s considered acceptable to out the folks that participated in the watergate scandal, but not ok to out a confidential informant.