Curiosity is what brought us to the top of the food chain. It's also what will bring us down to the bottom again.If your curiosity and trustiness causes you to end up on the BBQ as somebody's dinner, then you are not so smart. The fish that dart away are certainly wiser and smarter.
Now I would call humanity stupid for sure. We're following our own invented high-tech carrot-on-a-stick right off the cliff. That makes me wonder. Curiosity for sure can be seen as a sign of intelligence, but so can stupidity? I mean, you need a brain for it to malfunction.