UFO's: Visitors from another world or natural events?

I don’t really have an opinion on UFO’s. I think it can go either way. It is quite possible that there is life on other planets. There’s no way we would be able to know. There are many planets in our solar system that could support life. If people from earth can visit other planets, why cant beings from other planets come to earth? It is also very easy to not believe in UFO’s. Why would creatures from other planets come to the earth and not try to communicate with humans? There has not been any evidence of UFO’s either. It is also very easy to mistake spaceships for a natural event. Stars have been mistaken for UFO’s. Flocks of birds have also been mistaken for them. Many people claim to have seen UFO’s but they have no evidence. Some people could easily claim to have seen one and make false pictures. Some people think they have seen a UFO, when really they haven’t. It is an event that is quite hard to understand and explain. It is impossible to prove this theory when there is no evidence.