Story goes that actors were engaging in target practice with live rounds for 'training & familiarization'

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Personally seems a bit doubtful / I'd lean in the direction of some crew were probably just shooting live rounds in the desert as they were bored/nothing to do & one of those guns made it on set

Not at all...

The issue is fertility rates in the bulk of the northern hemisphere are already on the decline - those women having children, most are having 1 or 2 which isn't nearly enough to maintain population #s ... extreme examples include Japan, Norway & Russia (even before the war in Ukraine) which are net negative now and will continue to lose population baring substantial immigration.

China has peaked and the United States would be right behind if not for immigration keeping numbers up.

The only substantially growing population is in Sub-Sahara Africa / without that world pop would be on the decline

Gist (I think?) is he drove from Georiga to Orlando on something of a whim with his gun and got pissed off when he couldn't book a room at a hotel; went to ammunition store - buys ammunition - comes back to resort and starts shooting...goes to another resort starts shooting...leaves / crashes his car / and gets picked up by the cops and confesses to crime

This coulda been about 1000x worse