User blog comment:IamJakuhoRaikoben/Chapter 463: Black Carpet, Review./@comment-5303512-20151123103019/@comment-24102956-20151124153445

Yeah I know. Juvia killed Keith so Silver can be free from being bound on his world where he's already dead and Gray almost snaps in anger at her but forgives her for giving his father the Mercy Kill but deep down, he wanted his father to live.

For the rest of FT, they never actually killed anyone nor let them die throughout the series even if they deserved. Not even Seilah was given a peaceful death after Mira absorbed her and took her appearance completely.

Mavis also bloodied her hands as well due to her tactics and strategies employed by her Mages and soldiers who hired them during the Second Trade War that took lives of both sides. It's not like FT was made with rainbows and flowers and with no bloodshed.

Look at that, Zeref lampshades their no-kill policy after fully-aware that Ajeel and Brandish are still alive when they're defeated. He views it as a weakness and will use it against FT.