My personal fitness results would disagree, but your mileage may vary. In a day at the airsoft field I spend about 6 hours running with a few kilos of gear and whipping around a yard/meter of gun weighing 6~8 kilos, maybe 15-20 lbs. Just shouldering a gun for a half hour takes a lot more muscle and stamina than one might expect, and aiming around uses a lot of abdominal, back, and oblique muscle. Meanwhile your legs get a colossal workout running between rooms, squatting up and down to dodge, take positions, fire out of windows, etc.
I’ve been playing regularly, a few times a month, for about 2 years now and while I’ve definitely gotten in much better shape because of it, at the end of a particularly intense day I still get jelly legs and full body muscle fatigue.
If you’re interested most fields offer gear rentals so you can try it out and see how it works for you without having to make a big investment in your own stuff.
The US would rather try to pin mass shootings on social media platforms than address the core issues that might destabilize their status quo sociopolitical puppet show, which could set an incredibly dangerous precedent. I wouldn’t be surprised if some money happened to find its way into the right pockets to try the same thing on behalf of the poor poor megacorps’ “lost sales” in the near future.