Arrogant? I'd say they run about equal if they are
certain in their beliefs, since none of us can truly know.
As for your intelligent life angle; what makes you think a species technologically advanced enough to detect our presence would consider us intelligent? In order for them to have survived the dire predictions you have for us; they would have had to first evolve past the barbarism that we clearly have not. Look what we've learned in the last 100 years and consider what we might learn in a million, or billion.
![Idea](https://cdn2.able2know.org/images/v5/emoticons/icon_idea.gif)
They may well think we're one step ahead of iguana's intelligence-wise. Like Jodie Foster said in "contact", if we are alone, that sure would be a big waste of space. I'd say the most arrogant thing in your post would be your assumption that we are the most intelligent beings in the universe.
Ps, welcome to A2K!