"<a href=""https://www.youtube.com/watch?v=ZecQ64l-gKM&amp;t=1h05m06s"">1:05:06</a>  The reasons why aliens would not want to communicate with us are many:<br><br>1. There may be a "law"/agreement between advanced alien species not to communicate with less advanced civilizations until a specific threshold is crossed (same as in Star Trek).<br><br>2. There is no "us" to communicate with: there is no global government or organization that can represent the human race.<br>Who would you talk with? the UN? <br><br>3. They are not interested in us since we are not unique. There may be many civilizations out there and we may be just a backward benign race without anything they could learn from.<br><br>4. Aliens who come here are either tourists or scientists", both come to observe and experience, not teach or negotiate.