Life would be a rare event, or at least life as we know it so the chance of it in star system X is very slim. The fact that there are so many starts out there means that somewhere is is likely to exist, probably many times. By the same process we can assume that intelligent species have probably evolved elsewhere that have had more time to advance then we have. This then leaves us with two questions if the above is true 1. Have they found us and 2. If we have been discovered do they study us by invasive or passive methods from what I understand there seems to be nothing to answer these questions. Yes there are many reports out there, but vast numbers have been shown to be hoaxes or fantasy. The other element is that many of the sightings of UFOs seem to coincide with the secret testing of military hardware. Given the sensitivity of these activities it is not surprising that governments allow the UFO conspiracy to circulate freely, and perhaps even fuel it to take away from the real issue. This leaves very few truly unexplained cases which are very difficult to verify. Based on the above I believe that there is something out there, but they probably haven't been taking us onto their ships for some overnight dissection, however based on the remote chance that it is possible (and I mean VERY remote) I would be open to new ideas on the issue if the data was very convincing and 100% verified.