What about ovnis and aliens?

Is this real?
nobody knows certainly about the ovnis.

Don’t you think if this guys are more advanced than us, why they would allow us watch their ovnis? It’s pretty sure that if they have the technology to come from other worlds, they can hide between us, we would not be able to discover them even looking in their eyes. And what about transportation, I think their ovnis can be easily converted(by them) to regular planes or ships. So all these light’s shows maybe are not created by them. Nobody certainly knows about this, everyone speculates, but no irrefutable evidence shown. So we don’t know anything real about this.