Most bombers that are free kills will be free kills as a fighter with the same player in them. It has nothing to do with the performance or lethality of the guns. A bomber player beyond the clueless level is a much harder target to beat - and by beat I mean kill all 3 bombers. Yes, of course if you come with 5000 feet alt advantage and ahead of the bombers they are easy to kill, but so is a 262 in similar conditions.
Statistics in fighter vs. bomber can be misleading. Killing one drone and RTB'ing with a smoking engine will count fully towards the fighter, but the bomber will still drop hangars / level the town / etc with the other 2 bombers. A bomber also cannot finish a wounded fighter, so the common scenario in which fighter attacking the bombers does no real damage, getting smoked, and managing to RTB does not even enter the statistics. Not to mention the multitude bomber kills from bomb&bail, 0-alt carpet bombing, losing drones in turns without even being fired uppon, etc.
Bombers are not hard to kill, but neither are fighters, except that to take out one clueless player in a bomber takes much more ammo than to kill a good one in a fighter.