... The intensity of emotions in these debates...
Along with the passion and emotions, there is ignorance and apathy. Many gun owners are just plain uneducated, and some are simply apathetic about knowing the science.
Everyone has their own idea of what they need to know about a firearm, ammo, and self-defense.
Nearly all of the self-identified experts on YouTube, for example, that attempt to demonstrate their knowledge about a specific subject, rarely present the facts. Most of it is anecdotal Bravo Sierra.
There are a few who have a grasp of ballistics and actually show the “measurements” in comparisons. Others have lots of experience and have their opinions, valid or not. How many testing comparison demonstrations have you viewed state that the gelatin they are using is fresh out of refrigeration and is 39d F?
Some experts use profanity in every other sentence to convey the intensity of their “knowledge”. Some use all kinds of silly video tricks, music, and stupid sounding commentary.
Of my 14 range buddies, I would bet a 6-pack of their favorite beverage that none of them know or have ever viewed the Brass Fetcher Ballistic Testing. Yet all of them are highly experienced gun owners (retired military or presently involved in high security) and I’d trust any one of them with my life in a gun fight.
Since what I know about guns and ammo wouldn't make a pimple on Massad Ayoob's butt, if the FBI, with their incredible level of testing, has chosen Hornady Critical Defense FTX, Hornady HST, Sig V-Crown, and Speer Gold Dot, that’s good enough for me.