Actually, I really see the way we assault New York as the most realistic way. A light fighter is, in my opinion, the absolute best ship for this purpose. A capital ship fleet would be completely unrealistic. The local pirates could never assemble enough ships to take on a capital navy. It would be like Somalian pirates in speed boats taking on a carrier task force. It would ,however, be completely logical for a fighter or two to sneak in take out a defined target and zoom out before the navy can scramble an answer to it. Also, you have to realize that when I do attack, my goal is not always to hurt another ship, even though it is a bonus. Seven times out of ten I am causing a distraction for some other purpose and I leave at my earliest convenience when the mission is complete. The RP is not always clear to the lawfulls, tis life.
Remember, the original post wasn't about how bad and evil caps are, but rather a discussion of the stipulations behind disengaging from an area when there is no hope of victory and yet your purpose is completed successfully. Example: LF vs. Cruiser after target fighter is destroyed.
As for three bombers and a light fighter making a planned strike against a lone Dreadnaught without fighter cover that took just a couple minutes to accomplish. I doubt having shielded NPCs would have assisted anyone. The obvious outcome would have still happened and is a perfect example of a hit and fade.