Yup, it's strange that's so unpopular when it's mostly what current science points to:
Massive universe => It's pretty much certain that there's life, even intelligent life, out there.
Light speed limit => It's highly unlikely that we will meet each other.
Just in the observable universe there are around 2 trillion galaxies. Our galaxy (pretty average as galaxies go) has more than 100 billion star systems, each of them with their corresponding planets.
Even if the average density of life is just 1 planet per galaxy (which frankly speaking, would be ridiculously low), you'd have a couple of trillion of planets with life. Intelligence of course would be scarcer, but I don't think it's that anomalous in the large scheme of things.