I think JKR would have expected the tabloids to track down her ex. She was one of the phone hacking victims, wasn't she? She's no fool, she would have known this would probably happen, but bravely published anyway, because she's putting herself on the line for women.
The Sun's principle goal is to sell papers (or get clicks), yes, hence the click bait headline. However, I have swallowed my loathing of the rag and read the piece, and it is very supportive of JKR. Don't forget that the person who writes the article has no control over the headline.
The piece itself paints the ex as a drug user/loser, and clearly unable to see his own violence or take responsibility for his own conduct. Whilst he dismisses his conduct as "just a slap" , the piece refers to third parties being concerned about Jo and a member of the public calling the police on him for his conduct towards her in public. So clearly the slap was no isolated incident. The piece emphasises how short lived the relationship was and that JKR got out quickly. Again, I think it is alluding to the fact that is must have been pretty intensely awful - as opposed to a single incident over the course of a long marriage, which might be dismissed as an aberration (I hasten to add, not by me, I think all women should be zero tolerance).
The piece also contains a comment from Rachel Horman from the anti-stalking charity Paladin. She praises JKR's bravery and how painful it must have been for her to speak out.
It also refers to Jo's £1m donation last month to various charities supporting domestic violence survivors and the homeless. It adds, "While she has previously kept her abuse ordeal a secret, she has used her vast fortune to help others who have suffered."
And it also links to the Ickabog and how she has been encouraging children to post their pictures.
This piece is incredibly supportive of JKR. It's a shame that the headline seems to indicate the opposite, but it has served to expose the sheer hypocrisy for OJ, Jameel and the rest.