Because the words that are already in your mouth are factually incorrect. For example:
This is factually incorrect. The first guns were invented for warfare. Specifically, for use against large blocks of troops because they were not accurate. They were certainly not accurate enough for hunting - people hunted with spears and bows right up to the 17th century, a time when guns had been dominating battlefields for a couple of hundred years.
It's also in the last 100 years that guns have been accurate enough to hunt with.
According to Wikipedia (only my first stop in researching this, so it's not exactly inaccessible information), the first experiments in rifling firearm barrels took place in the 15th century, but black powder quickly fouled the barrels with soot and the amount of smoke produced and the method of warfare consisting of large, solid blocks of troops, made long-range accuracy fairly irrelevant anyway.
Contrast this to a hunting situation, where if you miss you don't get to eat. Accuracy is, shall we say, important. Clean powder, elongated bullets and rifling made firearms more accurate, and this is when they became useful for hunting.
Guns were used to kill people long before they were used to kill animals, or even paper targets.
Can you please read my posts?
I said first weapons not guns