McNugget
I disagree and I think you're missing the point; that some airlines have had no accidents is hardly relevant. If you have some 10 a/c company that takes 60 yrs to fly what another airline with 300 a/c will do in 5, the fact that first airline may have operated 20 yrs without incident means zilch.
If you mean comparing LH to SH is apples and oranges, again, I'd disagree. The primary metric is the loses per departure yardstick. The only difference will be it'll appear to the casual observer that LH is safer, which statistically may not be the case.