I dunno, each bombing run probably killed hundreds of people, and you had to do what, 20 or 25 runs before you were off the hook?
According that most accurate of sources,
Wikipedia, the top end estimate of German civilian casualities due to strategic bombing was 600,000. The bombing sorties totaled 754,818 just for the USA, plus another 687k for the Brits. Now, those casualities don't include non-Germans, or soldiers. But even if you assumed (of course incorrectly) that all German civilian and soldier deaths were due to strategic bombing (for a total of 6.95mil dead - 5.3mil soldiers, 1.65mil civilians) that's an average of 4.8 kills per sortie.
Even if you assume that half of the sorties failed to drop their bombs on the target, that's still less than 10 kills per sortie that makes it to the target. Condsidering how few crews survived their 25 mission tour of duty, especially early on, that's not
that many kills per crew. And if you figure 10 man crew for a bomber, that's 1 kill each on average per sortie that makes it to the target. Lots of snipers match or exceed that rate, even with a survival rate as bad or worse than the bomber crews.