But we're not an ant colony to them, we're already using technology that can be used for MAD (sending signals through the sun), and they know it from the start.
> Earth was an un-imaginable eden to Tri-Solaris, it's made clear that they wanted the planet intact.
As far as I understand every planet in the system was heaven for them, the orbit was important. Which is stupid, because you can make anything follow a circular orbit around some star.
> This [flu] requires a much longer timeline as multiple trips are required to carry out the plan.
Why? They have their stealth probe (don't remember how it was called), they can take a look at a spanish influenza or something and pimp it up a little. At worst they then need to send like 1 gram at almost light speed the conventional way - still much easier and faster than sending the armada.
> Given that you are saying they were stupid for not building space habitats, you must not be aware of what actually happened to the Tri-Solarans :).
They were destroyed because their coordinates were broadcasted. As they should expect from the start messing with civilization that broadcasted "hello".
> those space habitats present their own form of danger to their inhabitants. Actually, the danger they pose is worse than existing on a planet.
How? They aren't any less stealthy than sattelites, tv, or radio.