Taigia, I choose not to fully explain the reason behind the Arvonian relationship with Artificial Intelligence because USFP social psychologists don't yet understand it. It is a matter of historic fact that the relationship did not exist until after the Arvonians created The Supreme Understander. Previous to that they used AI in mundane and dangerous applications just as you and I do.
Earth's top minds explain this with three competing schools of thought:
1) Perhaps the Arvonians have a gamut of emotions that is naturally more passionate than humans. In addition to The Supreme Understander we know they have a fanatical love for their own Royal Family and an inexplicable love for Space Whales. Thus the Arvonians may simply be a race of galactic Romeos, quick, eager, and maybe even desperate to fall in love. When they discovered that they loved The Supreme Understander they took it to the extreme and declaired their undying love for all AI.
2) Perhaps the Arvonians have heightened parental instincts, and when they created The Supreme Understander the entire race viewed it as their perfect, ideal child. Thereafter they began to view more rudimentary AI as you and I might view babies. When a TSN ship launches a homing torpedo it might as well be hurling a human baby into space. It may not be an Arvonian baby, but the thought is still repugnant and fills any Arvonian heart with sadness.
3) Remember, some humans think of Arvonian society as a computer-controlled Dystopia. That school of thought says that The Supreme Understander uses its knowledge of Arvonian psychology, or perhaps even mind control, to manipulate their population into a form of AI-worshiping mass psychosis.
"Damn the torpedoes! Four bells, Captain Drayton!"
(Likely actual words of Admiral David Farragut, USN, at the battle of Mobile Bay. Four bells was the signal for the engine room to make full steam ahead).