Unless they're active colonizers, moving from solar system to solar system consuming all available resources, I don't see why we would want to fear them. Assumi

Unless they're active colonizers, moving from solar system to solar system consuming all available resources, I don't see why we would want to fear them. Assuming they are, if anything they would avoid solar systems that might have active defense. It's also possible such a civilization might follow much the model many hope to create for humanity, colonizing worlds then sending out new seed missions to every available world. If that's the case, there are three possibilities: A. They respect other life, and avoid inhabited systems. B. They fear other life, and seek out inhabited systems. C. They don't care about other life, and attempt to colonize all systems they can. Because of the assumed exponential growth life is capable of, and the distances between stars, the limiting factor is travel time, not growth, so it follows that the difference between B&C is negligible. Now, if they have some form of FTL travel, then B could be a problem. However, it seems likely that if FTL aliens were interested in destroying us, they would have found us by now and begun monitoring anyway.