Yes, it's a new-ish SF trope now that civilizations may go into self absorbed fantasy addiction in sealed-in hologrammatic environments, perhaps not even physically moving. Why actually do anything if the system can create experiences? I always think of this, whenever someone posts that constantly living in a holodeck would be perfect. It's not real, it's not life, it's scary as hell, and if future Trek has its head screwed on right, it'll have to start addressing this.
As for bullets in the First Contact movie, with the safeties off, obviously holo-bullets can kill... however when the bodies are carted off the holodeck to the morgue, the holo-bullets will disappear. The individuals will still stay just as dead.