>>64136669
Except none of those things are what aliens would want from us. There is nothing on Earth that you can't get easier elsewhere. Nothing except the life and genetic codes of Earth species.
You can't get a tree anywhere but Earth. An amber gemstone, or a slab of petrified wood is far rarer and more valuable to aliens than mundane minerals. To say nothing of the utility, novelty, and scientific value in a entire world's worth of life.
Basically, it's more likely that ayys want to hunt us for sport, predator style, than to kill us all.