The reason I say in person is because if the amount of information which is transmitted via direct conversation is orders of magnitude higher than through eye contact, tone, language and body language.
If you and I were talking right now, I could maintain eye contact, rotate my shoulders so I face you, position my head in a way that says I'm listening, use my voice to indicate that I'm contrite, or uncomfortable, or supportive.
It can be excruciatingly uncomfortable for people who are used to having virtual tools abstract away the hard parts of interaction. But that's exactly what (in this case) women are saying they feel. They feel, in the real world, they're not safe. To me, the weight of that comes from a direct interaction rather than a news article or twitter post.