User blog comment:Miskos3/Fairy Tail 538: When the Flame Goes Out, Review/@comment-135373-20170606083753/@comment-7418318-20170606101812

Of all the things you go on about Era?

Zeref committed so many crimes himself and yet the one that you say he should have payed for is something he didn't even do?

The only reason why he kept monitoring Tartaros later in the series was because Natsu was there. In all likelyhood he didn't even know what Tartaros did until after it had already happened.

So yeah, either blame Zeref for his own crimes or blame the one who committed or the one who ordered this particular crime, which would be Jackal and Mard Geer respectively. Zeref had nothing to do with it other than creating the Demons some 400 years in the past. He's about as guilty of the destruction of Era as a parent is for any crimes their children committed.