I knew that comment would stir up some feelings! :-)
Interstellar travel is an entirely different kettle of fish to reaching the moon.
It's simply impossible to travel faster than the speed of light assuming we agree that the laws of physics as currently defined are correct. Please do not talk to me about quantum teleportation or refutations of the Einstein-Podolsky-Rosenberg (EPR) paradox. The laws of physics are different at the quantum level, but we exist at the macroscopic level. Any arguments to the contrary are just like me saying I could disappear in a poof of quantum smoke. Theoretically possible, but not really.
So...
We are left with the limitations presented by the speed of light. That precludes the concept of interstellar travel. To argue otherwise shows either a lack of understanding of the distances involved, or an alarming (self-delusional?) sense of optimism.
Sure, let's invest in space exploration within the solar system. Why not? But I don't think we're gonna get out of this small, inconsequential little star system in a backward corner of the Milky Way. Why not just accept it?
BTW, I also refute the idea that we won't get off this planet in 5 billion years. I don't think the human species will last beyond a couple of million at the outside.
Mr Mephisto