Do you think aliens in ufos have visited Earth? (And all things UFO)

I mean what should we be afraid of?

If they can travel to other planets, surely any minerals or other natural resources available here are also available on one of the trillions of uninhabited planets out there.

I can't imagine anything we have here that they would want to take from us that they couldn't get with much less trouble somewhere else.
Fell upon a documentary (?) on Prime yesterday. I'm not going to say I buy it and only watched about 1/2 before losing interest, but his argument is pretty good. It dovetails nicely with your sentiment that if there was an interstellar species which meant us harm, there's little hope so chances are they aren't very hostile.