>> One of my friends thinks my concept work on reducing the cost of 
>> materials transport by sub orbital rocket and multi GW propulsion 
>> laser would not cause me any trouble even if I went on a lecture tour 
>> about it in China.  Others think I would be arrested and jailed for

Two sides to this. First is, if anyone has the quadrillions of dollars
required to actually implement your considerably audacious plan, they will
assuredly have enough money to develop other, more destructive weapons, for
lower cost.

The second is, you don't need a massive space based laser to cause massive
damage. Simply strap a booster to any moderately sized asteroid, and nudge
it toward the earthbound target. Cheap and very very dangerous.

c

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