we (humans) go on safari's to watch lions eat zebra's and giraffes' frolic next to elephants .

we go scuba diving to view fishes .

why wouldnt an advanced culture come veiw us ? especially since we've detonated a few nuke's which im sure sent ripples through all of space

not to mention all the radio waves we broadcast endlessly .

there are endless wacky theories about their motives , but i think its all about curiosity .