What Are UFO's?

What are UFO's-And how are they perceived by humans?

Definition of UFO:
An un-identified flying object.
Therefore, with this definition in mind, any un-identified flying object can be perceived as a 'UFO.' And has nothing to do with some perceived being from another planet, whose intentions are perceived to be bent on doing harm to us humans. As a matter of fact, it is only the American mentality that holds the view that ALIENS are bent on doing harm to humans!
* Firstly, why would an alien/aliens want to do harm to humans?
* Why do Americans/Hollywood producers feel that UFO's would be a threat to humankind, and that we must prepare for the worst case scenario, should they set foot on this planet?
* And what kind of weaponry would be the choice of defense of this planet?
* And what nation on this planet would be attacked first?
* And finally, how would this defense take place, if all nations do not have the knowledge of, and type of so-called enemy we would be confronting. It's ability to do us (humans harm), the type of warfare that we will be confronted with, or the place such battles will begin to unfold!
Given this lack of comprehension, the magnitude of this so-called threat, the type and nature of this so-called enemy, and the motive for such attack. I totally disagree with all those 'dooms-day' individuals who seem so obsessed and paranoid, that humans will ever be attacked by aliens from another planet.
Furthermore, we humans can barely afford to make a flight to Mars currently, we lack the where-withal to survive any planet outside our own, without the supply of oxygen, protection from extreme cold & heat, (solar winds, gamma rays from the sun), and all the other gases that planets beyond our solar system have, that would impair human survival.
And because of this lack of technology by humans, the inability to survive the way we are aclimatized here on earth, the language barrier (supposedly) that such creatures might offer, the type or nature of such creatures (if any) would pose, and the inability to communicate with such creatures or beings, (if they do exist).
I say that such a scenario is too pre-posterous to even contemplate seriously, much less envision!
Om Shanti.
Derryck S. Griffith.