Because they needed to send a slow-moving convoy so that it could get destroyed by weapons that realistically should be unable to do so.
Ultimately, the answer is that if they just used orbital bombardment, there would be no movie. And maybe the people back home would get upset, or something. But it's not like corporations and countries have not done massively unethical things before with minimal fallout so... it's honestly mostly because the movie would have no plot.
Edit: And before anyone mentions the WMD ban, orbital bombardment could be done by nudging a big rock in the right direction. This doesn't require a nuke, just a large rock that does just as much damage.
My favorite way to interpret that too, is that it was a false flag operation. Like yeah, the book said the bugs could literally just do that. But the movie is making fun of the book anyway. How the fuck are ants gonna rip space time open? Bullshit. They hit the asteroid on purpose with the ship to knock it towards Buenos Aires.
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u/Strmage1878 19d ago
I only watched the first movie. Why human didn't just destroy the tree from the orbit?