What difference would it make if there were extraterrestrial life?
How would an advanced Alien intelligence view human beings, who exploit and slaughter intelligent life around them on a daily basis, including other human beings, and helpless animals who they raise under torturous conditions and then dismember while conscious in order to consume them -- needlessly, as our physiology does not require animal products.
Not to mention the warmongering, as the majority of the U.S. public supported war -- as long as it seemed convenient. No anti-war stance on principle for most U.S. citizens, bogglingly, especially after the lessons of Vietnam.
A lack of human rights or environmental laws in the most populous country on Earth.
Widespread environmental destruction, wiping out forests and ecosystems all over the globe.
I don't think Aliens would be too impressed with humanity in general, including SETI researchers who retire to the cafeteria for a nice plate of murdered intelligent being on a daily basis.