[MarketingJason]

I'm no rocket scientist, but to me it makes sense to try and redirect asteroids to enter our atmosphere. The only thing I'd seek to "mine" on the asteroid is H2O, Hydrogen, or something that could be immediately converted to power/propulsion by the unit-itself.

I guess one risk would be introducing unknown biological or chemical nastiness. Another would be how precise we could be to target open ocean/desert/etc.

[dyauspitr]

That’s insanely irresponsible. Even if everything goes perfectly you’re going to have volcano tier dust plumes altering the local climate and in the worst case you could kill millions of people by wiping out entire cities.