Scientist are getting close to finding Earth-like planets out there which could possibly be the home for other civilizations like us, or not. For our own good let's be optimist and think that they are not like us. The time that will pass between finding the planet, sending a robotic mission and hopefully tweeting with "them" will be great, but not this is what interests us.
In fact, forget the introduction and think of it this way, what would you ask an alien if you would have that possibility. I would go for the history to understand who/what they are. Learning their language would not be that bad. Another question that you should put yourself is how would you react when "he/her/it" would stand in front of you. Ugly or beautiful, it does not matter how they look, you realize that you take part at something historical and that there are possibilities for things to go wrong. Just remember how the Europeans colonized the New World, wouldn't want to be an Inca.
If you and I are rational people, what about the rest? This question alone could be on the lips and in the minds of those who now know about extraterrestrials, if the "conspiracy theories" are true. I am not so sure that "they" would be interested in forming with us an "intergalactic rugby cup competition" or start commerce with iPhones or cocaine. So what would average Joe have to do with "them"? They would probably say that we are not prepared, or less polite, that we are stupid.
This leaves us with only one solution, hope they are peaceful and hope that we will evolve. Realizing our current situation, it's kind of useless to want disclosure if you are not interested in research about and with "them" and chances are that if you are any good in your field you are already part of a "team".
The truth is we have many more things to fix and we should concentrate on those while trying to find other forms of life. This idea of Extraterrestrial Life is important and will prove to be the beginning of a new era for the development of humanity. The novelty of it will pass after the "contacts", this I am convinced, and our eyes will be set on other, even greater tasks.
MICHAUD, Michael, Contact with Alien Civilizations, Copernicus Books, 2001
And for fun, Earth, a visitors guide to the human race, by Jon Stewart