Well, like someone said before in this post, bombers are supposed to kill caps...
Actually, bombers are only good at killing big ships, skilled bombers can kill other stuff too, but only becouse they are skilled compared to theyr oponents, not becouse bombers are "broken".
Caps should not be invincible, this game, a space flight game, is similar to what we had a few years ago in naval battles during WW1 and WW2, big ships are vulnerable to maneuverable small craft with powerfull weapons, or even small craft that fire from far out, so they should have some escort for protection, you dont see an USA carrier in the Persian Gulf without a bunch of escorts and full time surveilance, even if he could level the entire continent with his weapons.
Just remember in WW2 what hapenned to the German Battleship Bismarck when his steering gear was hit by some old little RAF biplanes torpedos, the biggest and most powerfull battleship (i think it was at least), got crippled by some elder crappy biplanes that had only one role at that mission, torp him down, and then he was an easy target.
Actually, when you make caps being vulnerable to bombers, you are actually having a system in which you brake players from only wanting to have caps, its like that game "rock paper scissors", you can have the most powerfull ship, but hey, you have to be carefull too, for there is something out there that can and will beat you.