Akhenaten
Heretic Pharaoh
Whoever said anything about mistakes?
You did. Right their in this post:
The above posters are right. However their might be a delay between the unmanned probes and when the aliens arrive. Probes might have looked at Earth 200 years ago and decided everything is OK for takeover. Now when they arrive they find we might put up resistance and so leave.
Twice . . .
They look at a world, see people who use only primitive technology. Then a few centuries pass. The natives mess up the environment or use all the natural resources. This would make it unsuitable for their purposes.
Then I worry how they will deal with the natives.
Is this seriously the sort of thing that you worry about?
They may not be hostile but when Europeans settled the rest of the world the natives did not do very well. For example in Australia many were shot. Others were given diseases. After all they were about to go extinct. Australia's constitution (written in the 1890s) was very racist. If the aliens are refugees they will have an incentive to be hostile to the natives.
What in the name of Hathor does this drivel have to do with crop circles?