What do they see that we cannot?
The most prolific observation of humanity is our ability to pollute, our oceans and our Earth Space? This is perhaps one of several similar things that they, if they exist are seeing us do?
The other is our limitations, since we have only a early technology, developed from the 1940s which is seventy-seven or so years old? Perhaps if they are out there watching, they may know that the vastness of space cannot be crossed and that we still have a long way to go?
2 Chronicles 36:15-16, Genesis 6:3, 19:9, Hebrews 3:15, Revelation 9:20-21.
Ask me and I will tell you! 