Song Lyrics in FFXIV: Compilation, Discussion, and Interpretation

[Hinoto-no-Ryuji]

His has an intense theme of the character being betrayed (by their leaders, what they feel to be necessary, and even the world) and how descending into depravity and accepting him (Sephirot) will take all of the pain away. While I still hesitate to say that Hydaelyn is referenced in the line "Necessity is an inventive mother," which is a turn of a common phrase, there is definitely something with this song.

Remember, though, that Sephirot was summoned when the Allagans renewed their campaign against Meracydia in earnest. I imagine things weren't exactly great for its inhabitants at the time, and they were probably getting increasingly desperate as their attackers' newly-resurrected nihilistic leader tore his way through their homeland. It's (probably) in that context that we're meant to read it, and it fits your interpretation just as well (if not even better than) current events while sticking to the pattern established thus far.