The Laws of the Handwave

[Kokuten]

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avoid the "space rocks from Gamelon" bombardment

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As for the reason that noone is using kinetic energy weapons against the Earth, or as terror weapons..

After the Professor Incident, mentioned in the Grand Unified Timeline, the Fen, and by low profile communications, the 'danes, have agreed on the Eridani Edict.
Again borrowed from the Honorverse, the Eridani Edict is even adhered to by pirates and genetic slavers - you don't huck nukes or KEW at an inhabited world. If you do, _everyone_ is your enemy. All doors are closed to you, and all hands will be raised against you.
Earth is the Mother Planet. No matter who you are, that's where you came from.
The existence of the Eridani Edict, even with the 'weapons-friendlier' 'wavium upgrade, will keep the conflict at a ship-to-ship or fleet-to-fleet level.
Incidental pebbles and dust and buicks can be accounted for by the atmosphere.Wire Geek - Burning the weak and trampling the dead since 1979