Real+or+Fake?

I do not believe in UFOs. First of all, it is so easy to just flash colored lights in the air. Next, there is no such thing as aliens as I believe. A lot of times there is just an illusion that causes people to think that it is a UFO. Also in one of the sightings, they said it crashed outside the city. They would have found it if it actually crashed outside of the city. Also, since almost all of the sightings have been in fog, people can not see the object properly. They might think that it is a UFO, but it probably is just an optical illusion.