Why would they lie?... I'm not saying they're telling the truth, but.... I wouldn't say otherwise either.
But I'm a little more open-minded.
Also, absence of evidence is not evidence of absence. There are many things that we cannot ordinarily explain, yet they exist.
That's a fact. I tend to think there's a lot of stuff in the Universe that we simply don't have the capacity to measure/see in our current state of development.
Let's face it: Microwaves (for example) existed for millions of years before we decided we could detect them!