Yeah but lacking evidence, is it really any more logical that they would have enough of a vector to descend into the atmosphere instead of just saying in orbit (much less being blasted out of orbit)? And of the ones coming down to atmosphere shoudln't most of these have been in slow decaying orbits instead of meteoric descents?
Logic dictates that if something explodes, fragments go in all directions. And logic also dicates that a LOT of those 1.8 million destroyed vessels exploded(about 1 million were vaporized by the grand cannon, leaving 800,000 to be blown up by less unbconventional means).
Which means that a lot of fragments DID head towards Earth.
And yes, most of them should've taken the long way to get there instead of coming in in a straight line.
But then they hit the atmosphere and either burned up or hit something, depending on what angle they hit at and how large they were.
Either way, they introduce debris into the air. If they hit the ground they knock dust into the air. If they burn up in the atmosphere, it just means they're now a cloud of dust floating in the air.
And dust is our enemy in this scenario.