If there are aliens out there and they have the physical form and ability to travel unthinkable distance, i would assume they would WANT to contact us. Everything on this planet be it nature or human technology would be THE GOLDMINE for any alien species traveling great distance. They wouldn’t want to just kill us all off, they probably spent the last 10million years attempting to find life. Also that makes me think that IF they had the technology to travel, they may very well have the means to detect life from far away as well. By far i mean way farther than any distance we can imagine. Otherwise it truly is a pointless mission to just launch away into space even with the ability to. So who knows