It's a valid point: Why bother traversing the galaxy in order to meet a bunch of bickering apes that can't even look after their own planet? In my opinion, if there are aliens out there, more advanced than us, they'll probably do their best to avoid Earth altogether.
Also, interstellar travel. Assuming you go along with accepted physics, it's impossible to go faster than light. The faster you go, the greater your mass, hence the greater your energy, and at the speed of light (Or the largest possible fraction of it) you'd just end up as molecular gloop.
Even if light-speed was possible, it would be nigh on pointless because even at that kind of speed, it takes years to reach the nearest star. The nearest planet is even further and the nearest one with potential is barely a micrometre-wide blip on our largest telescope. Light takes millions of years to reach Earth from distant stars.
So, our best hope is something akin to 'hyperspace'. But what might this be?
The dangerous thing about discussing this, of course, is that it's far too easy to slip into sci-fi. Black holes aren't really holes; Wormholes can't be created and sustained without some kind of exotic matter. Assuming we discover this 'exotic matter' to keep a small wormhole from collapsing, it would be extremely dangerous. This shouldn't be much of a problem once it is contained and controlled - after all, there's enough potential energy in your computer to destroy a sizable chunk of the planet:
In a nutshell, this means that in every piece of matter (M) there's a ton of energy(E), and that energy is the matter(M) multiplied by the speed(C), and squared. Something actually travelling at the speed of light, therefore...