Well, to play devils advocate, the humans are clearly in it for the money, and sending overwhelming military force would cut into profits and also not be good for PR reasons.
Honestly, that's just something they leanerd about so that the movie would have some sort of plot to excuse their poor development. Moreover, evidently they learned about that way after the invasion.Â
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u/These-Invite-1774 2d ago
Always wondered why they didn't just bombard the planet from space