I'm bringing us back to the Hecate topic, and I think a lot of you are missing a key fact regarding it:
Space is big. Really, REALLY big.
A dedicated carrier is actually in no more danger than any other class of ship simply because you have to FIND the damn thing first, and even within the confines of a single star system, that's a lot of space to search through. With subspace drives, a carrier, even if found, can frequently simply jump out of the area and be safe, leaving it's fighters and bombers to handle the enemy ships. The way you guys are talking, it would be better to not have ships at all, because they might get destroyed. It happens, get over it.
Side note, aside from a few of the fighters in the game, ALL the ships in FS2 were designed before the Second Incursion. That said, the Hecate was likely created well before ANY of the others you see that are not Great War vets. In that time period you have the following:
1.) A divided Terran population (multiple Terran factions).
2.) A barely functioning economy (Earth was the hub of all things)
3.) They probably didn't have big honking space lasers
The Hecate was designed to counter the Shivan fighter/bomber threat and to deliver the most powerful weapons in the GTVA arsenal: Bombs. Harbingers and the like. THESE are what took down most of the Shivan capital ships in the Great War, including the Lucifer itself. It makes sense that they would design a ship specifically to perform such tasks, and that is the Hecate.
It also helps that if a bunch of fighters getting killed trying to take down an enemy destroyer, than the losses in personal and material is much, MUCH less than if a beam cannon toting Hatty gets blown to hell in the same engagement. It's very similar to the change in navel tactics during WWII, from big gun battleships, that could certainly rip through any carrier they ran into, to the carrier, which never even had to get remotely close. Battleships were too vulnerable to the cheap fighters, and so they disappeared.
Based on cost, utility, and flexibility, I'd rather have a Hecate on the battlefield than a tweaked out Orion. Or not on the battlefield but instead having it's fighter groups there, as the case may be.