User blog comment:IamJakuhoRaikoben/Chapter 449: Mavis & Zeref, Review./@comment-24367018-20150824120416

Well, that's not what I was hoping for. Mavis as a schoolgirl, meh. Met by coincidence twice. ._. You know what they say about coincidences; they take an awful lot of planning. Mavis was the chief tactician for FT during the Second Trade War, so if she's looking at her enemies as simply that, not human. So if she was afflicted by Ankhseram's curse as we've now found out she was, she was unknowingly in control of it. And of course she finds out on the day Makarov's born, of course she does >.<

Speculation time; Mavis restarts coveting the value of life, Ankhseram curse goes out of control, Makarov's mum snuffs it as a result. After a fuck tone of research and perhaps after faking her own death, the four great fairy magics are developed which leads to Mavis being crystalised as Lumen Histoire. Maybe not quite in that order mind.

It's probably because Mavis was cursed that FT developed such a notion towards respecting the sanctity of life.