Not sure if you're being sarcastic.

I guess the better question would be, if we are smart why are we throwing away so much useful stuff?

Yea, it's a joke. I guess it doesn't come across well, but if you say it in person while people are talking about crows, people will usually laugh :)

Because we are not smart enough to figure out how to stop being so wasteful?

they're smart. so they eat our garbage.

we throw out what tonnage of good food a year?