Can we appreciate for a moment that Omega met its equal in Midgardsormr, a creature long-lived beyond all reason, and powerful beyond imagining? When Midgardsormr's celestial home was devastated by whatever war had been waged with Omega's creators, the Elder Wyrm was still capable of presumably hammering Omega into the dirt long enough to flee with a little over half a dozen offspring, and travel for such an astoundingly long time that it grew to biblically ridiculous size and its mane of eldritch fire extinguished in the vacuum of space.
Omega gave chase to Midgardsormr for SO LONG that Omega either damaged its guidance system beyond repair, or literally lacked the memory capacity to maintain navigational data to return to its star of origin.
It lacks other directives! It does what it does across all the Final Fantasy games because it's stuck in a loop it can't free itself from.
Are you not yet absolutely heartbroken for this massive deadly machine-cricket?