How can I be certain I know what you mean.

Ever since Earth’s atmosphere had sufficient oxygen to sustain fire given a fuel source and heat, fire has exists.

If we can lay the blame on anyone for having started fire it’s going to be whoever fine tuned the constants such that there is anything here at all.

I wasn't at all sure what you meant. The emphasis in your comment could very easily have been on "We" (another hominid discovered how to harness fire, which seems to be your intent) or on "invent" (fire happens in nature, hominids didn't invent it at all). The latter is perfectly in line with the kind of "attempting to be clever but actually just annoying" pedantry that nerdy internet spaces often see.