I believe I’ve already covered that one. The old “can’t yell fire” canard is a pet peeve of mine. It has nothing whatsoever to do with limitations on the first amendment, but is regularly trotted out as an argument against gun rights.
Any fool can see that falsely yelling “fire” in order to cause a panic has CONSEQUENCES. The restriction has always been about the consequences, not the act. Yelling FIRE in a crowded theater when the theater is on fire is not only protected speech, but it’s the wise choice. If you were to yell “Tomato”, no one would evacuate the building.
Yet there’s always some fool who’ll trot out the lie to justify restricting the rights of others.
H.
Yet you still haven’t answered the question. Let’s assume somehow you acquire, or build, a MOAB. Should you legally be allowed to keep that weapon? And if not, what would be the constitutional prohibition against you owning it?