How does a species acquire space-faring capabilities without any intelligence? They are some sort of biological entity that evolved to survive in space? Like the Zerg? Even if there were biological entities that could survive in space, it's very unlikely that they could evolve interstellar travel, much less point them in our direction.
Complex behaviour isn't unique to intelligent animals here on earth.
Ants have no self-awareness, but can accomplish some pretty complex stuff.
I could imagine similar stuff that result in space travel.
Or maybe they are space whales, who knows.
This is a wild speculation thread, anything that doesn't break the laws of physics is possible!
If they're advanced enough to do that, I don't see why they don't just harness energy from one of the many other stars out there. What makes our sun so special? If they need minerals, or water, or something material, why not just mine one of the multitude of other planets out there? What makes Earth so special?
Nothing, we just have some resources.
Say they're just taking apart every solar system they find, using them all up for resources regardless of how inefficient it is because they intend on using up the entire galaxy eventually. We might just happen be next in line, and instead of taking a detour around us and open up the possibility of us resisting later on or stopping their resource mongering, they might just chose to destroy us.
Or they might mine X material from the Sun without any care for the earthlings on planet earth. We'd just happen to get destroyed because our Sun was next in line.
The point is, they are alien.
We have no idea under what circumstances they evolved and what the end-product might think.
These are all possibilities, and it's prudent to not dismiss any one of them.
Even if we're going to use ourselves as a basis for alien behavior, nothing suggested reason-wise is out of order for an extrapolation of human intelligence.