Are UFO's real?

If so, why haven't they made contact? We've seen various UFO pictures that may or may not be real. Some UFO pics are still unexplained phenomenons because the experts haven't found a way to debunk them. We have seen various UFO videos and alien pictures on credible channels, such as the Sci-Fi Channel or the Discovery Channel. For example, the Phoenix UFO video of 1997 (Not the one from April 2008) has been analyzed by experts with no conclusion of the UFO's its origins. With various UFO videos taken from numerous witnesses around the world, why haven't we come to a conclusion on what these UFO's are?

Many conspiracy theorists have various excuses to why UFO's have yet to make contact.

Here are just a few examples of why the aliens haven't made contact

  • They do not want to interfere. Yes, aliens have ethics, according to this theory
  • They may not be able to adapt to our environment. Then why not send radio waves? Or maybe Morse code?
  • They don't want to start worldwide chaos. They believe that their obvious presence may do more harm than good
  • They're waiting until human civilization is the brink of collapse in order to help us. That's why they're seen hovering around in UFO videos. They're just checking up on us

We can ponder all we want, but we truly don't know if aliens do exist and why they haven't made contact. Do you know of any interesting UFO videos? What are your thoughts?