You can't twist something if there isn't anything there to twist. In Proven Guilty JB will open with a trial. Where Harry will complain about the the Councils lack of outreach to young people coming into their power. Yet Molly happens right under his nose. And as I said, intentions don't matter, what matters are outcomes. It's one thing to make decisions knowing that it will impact people, it is an altogether different thing to blunder into them like a bull in a china shop. Which is pre changes Harry.
Really? Right under his nose? First all, Harry isn't living at the Carpenter house, so no daily contact with Molly. From the sound of it, it might have even been a year or two since he saw her given the physical changes from pubescent young teen at thirteen or fourteen, to brick outhouse shaped sixteen year old.. When she calls from jail, the first thing she tells him is there has been a lot of trouble at home, mainly between her and her parents, as in Molly in full rebellion. No confession about using black magic yet, Harry tries to do the right thing by returning her to her parents. Harry had been avoiding Michael for a couple of years because of Lasciel.
So, under Harry's nose? No, nor did Molly say anything to him about her budding talent, it isn't until after she is rescued and safe at Father Forthills, that she begins to tell him about it, her abilty to do a veil for example, then instead of going to him for help and to ask questions, she choses to Barns&Noble for books on the subject, but they do not cover the Laws of Magic as set down by the White Council. Molly then proceeds to apply her own moral judgement coupled with ignorance to go into the mind of her friend to stop his drug addiction.. Which sends her down the primrose warlock path and turns her friend's brain to mush.
Harry again does the right thing as soon as she confesses to take her before the White Council, he then puts it all on the line for her, which is literally his head to save hers.
1] Harry hadn't seen Molly in a couple of years, he hadn't been to the Carpenter home, he hadn't talked to Michael. 2] When Molly discovered her talent, she chose not to look up the only wizard she knew to ask questions, she went to Barns&Noble instead. 3] Since Harry had no clue about Charity and the road she almost took, he would have no reason to be on the lookout for it showing up in her kids. Since before it reared it's ugly head, Charity would not allow such a subject to be objective debated in her house, the dangers of unsupervised talent just wouldn't have come up. Also until it almost cost her daughter her head, Charity wouldn't have allowed Harry to supervise Molly in the first place. No, none of this takes place under his nose, nor is he the blame for what Molly chose to do.