User blog comment:B214/Chapter 504: Rift/@comment-4945830-20161002203645/@comment-5303512-20161003020625

@B214; yes, that is what the dark powers does to people, it takes the best of intentions and turns it into something wicked and unsightly, any characters in different series have suffered that fate, Gray is no different, neither is Natsu at this power.

What you said after that is basically ignoring the main point, the fact that Gray learned the truth of END, it is as if his desires overwrote his rational thinking, the IDS powers have already gotten a strong hold of him.