That doesn't make it any better, or less bad, because of the other additives it contains, for consistent performance over a wide temperature range, from standin

That doesn't make it any better, or less bad, because of the other additives it contains, for consistent performance over a wide temperature range, from standing on glowing tarmac/concrete, in the desert sun, to arctic cold, and much other stuff. Search for something like "toxicologic(al) asessment/profile of jet fuel" and prepare to have your mind blown. While what pops up then mostly covers the military variants like JP-4,7,8, there is enough about the civil use Jet-A1 you are talking about.