Personally I think we need to get out heads out of space until we learn how to take care of the planet we live on first...no point in screwing somewhere else up since we're so close to finishing this one off. I'm sure the neighbors would appreciate it.
It hurts my heart to hear people say this. While there is a measure of reason within it.. We can afford to seek out new life and new worlds. The price of it is simply microscopic in comparisons to most other endeavors within our government, and the governments of other nations. These are the things that inspire us! Lets us make new discoveries, new dreams..
To go outside at night, to look up into the sky with an awe inspired eye.. And to let the mind wander, to simply imagine what, or who is out there. To know for absolute certain that we are connected to the universe in yet another way.. Intelligent life. Making such a discovery would change the entire world. As Michio Kaku said, it would be on the same level as our species discovering fire..
Can we talk with such beings, over so vaste a distance? No, probably not. But it would be a glorious start 
It is in my opinion, that the next 50 years here on Earth will decide our fate. We either survive and continue forward to a wondrous start of exploration of our solar system in its entirety, or we are trapped here, on this one small blue dot in the middle of no where; and at the complete mercy of a space rock with our names on it. Or the even worse threat: Super Massive Volcanoes that could at any moment greatly reduce our ability to get a tan. For years. It happened once, 75,000ish years ago. Our entire species was almost wiped out. We went from millions in number, to a few thousand in just a few years.. Something like that today would wipe out billions. So it is best, for our people, that we not keep all our eggs in one basket. Life's prerogative is to survive and live life to the fullest.
We have an obligation to the Earth, to protect it as best we can. It is the place of our birth after all. However, we have an even greater obligation to our species. To what we could one day become; explorers of the galaxy! Ahh.. So many things that we yet do not quite understand. Sooo many discoveries have been made in physics, and astronomy, chemistry, bio-tech and computer technologies over the last ten years, it almost blows the mind! The discovery of how lifeless compounds become living things.. The first artificial lifeforms were created not long ago, from scratch! Soon such a technology could help clean the planet of some of the toxins that our advancement has placed upon it. Quantum computers are in the early testing phases, a computer that would have an intellect far superior to our own is around 20 years off, for practical use anyway.. Replicators, yep that's right, replicators are also in the works. Think about that for a moment. Food and clothing for everyone out there that would want it. Power, clean power from the new plants that are being built (if it works as intended anyway) in France.. A few dozen of those machines could power the entire planet. A truly marvelous revolution is there, just on the horizon of tomorrow. Will any of these things come to pass? I don't know. I hope so. Will we just end up destroying ourselves through senseless conflict or lack of foresight? I don't know. I hope not. But what I do know is that taking away that which gives us our vision..our dreams.. It is then that we are certainly to fail not only at saving our world, but at saving ourselves as a whole. Our entire past would be rendered moot, everything that humanity has overcome, and all the things we have yet to overcome.. A sadness on a universal level. To have been given the chance to be alive, to see and understand and appreciate our world around us, from the smallest to the largest of scales, only to have been snuffed out by a lack of vision.. I can think of no greater a tragedy than that. The gift of awareness lost to the darkness of space.
I apologize for rambling on, however this happens to be a subject of which I am very passionate about. I'm one of those hopeless idealist who believes in humanity. We have done many great things.. Some of them were terrible things, others were good. I know as a people we have a long way to go, and that we have yet many more terrible things to do, and many more great benevolent things to do. I just hope that in time, that which is good far outweighs that which was not so good. Well, this is just one mans opinion on a subject that involves every single one of us, past, present, and future. Here's to us being around to see if it all works out.
PS... Don't ever trust transporters. Take a shuttle.