Hi again @fycee!
If we make ourselves too focused on the thought of finding life on other planets or galaxies, it's gonna be too much time will be wasted, a lot of imagination and burst of brain cells would be involved. This diverts our attention to the real world we should need to focus on.
It is true that there are many other problems that require our full attention. And I suppose many people don't agree with the space explorations being conducted by NASA and other institutions around the world. They spend too much money creating spacecraft and stations off the planet.
Man (and woman) cannot help wondering about their origin and I suppose that expanding our minds to new paradigms such as space travel and knowledge of the vast universe, is what has evolved technology and human thinking. And of course, we can't avoid to ask ourselves: are we alone?
If these so-called aliens doesn't want themselves to get known then why should we bother digging much about them.
As I said to a dear friend, down below:
But thanks God for First Directive
In the universe of Star Trek, the First Directive or guideline, is General Order No. 1, is the most important principle of the rectors of the United Federation of Planets. The First Directive states that there can be no interference with the internal development of alien civilizations. It is the first of 32 directives governing Starfleet.
I guess that's why the aliens haven't manifested openly. They can't interfere with our own evolution... Or are they doing that?
Thanks for your time 
Cheers!
Thanks so much for the response. It just crossed my mind and led me into thinking, are these explorations just a big scam? They could probably hire good programmers who worked for the top of the charts movies just to create a scene that they are actually doing these explorations and get all the funding they could have. and it costs Billions of Dollars which came from the pockets of taxpayers. Darn!
Another thing, I guess it's what we call faith. We believe about their existence without even being proven. And it also calls the same thing with our faith to God being tested. His existence was not yet proven as well but we do believe in Him.
I think that although the more orthodox religions may stagger, what will endure will be those with more faith.