Fine, well if you'll go with the constance of human behaviour, how about you stop with the cherry-picking of historical events? The Chinese back in the 14th century would go all around the world as they knew it in peace, even in places where they could have easily dominated and conquered such as Africa. To use Colombus' example as if it was what always happens when civilisations meet is just bullshit. Maybe that's far from obvious if your knowledge of history is centred on the Americas.
Furthermore, while basic human behaviour remains the same, civilisation and society progresses and advances morally, which is why people don't consider it acceptable anymore to make slaves, only a century or two after it was abolished.
And obviously the elephant in the room, aliens are not humans. See my comment about making the mistake of projecting the familiar onto the utterly unknown.
As for your points, well, they're kind of bullshit. What civilisation do cattle have? None. As such they're quite boring. They have nothing to teach us except for what biology teaches us, as they don't transmit knowledge from generation to generation. Nothing they've done is worth studying really. Whereas civilisations, all civilisations, are worthy of being thoroughly studied. Again, you seem to have (dis)missed my point about us being more interesting left intact than "as a resource". Also you clearly overestimate our interest "as a resource". What's so good about our resources? Water? We don't even have that much non-salty water, whereas the universe is full of it. Oxygen? Again, it's not even like there's so much oxygen here that is not readily available in other places or in other ways. Minerals? Once again, there's not much you'll find here that you won't find anywhere else. It's not like there's even a lot of oil left. You'd think they'd want to eat us or any of our animals? How likely do you think this is that Earth meat is any good to a creature that would be the product of an isolated biological evolution? We share DNA with what we eat.
Also, thinking that we would be of no interest to the curiosity of any eventual alien civilisation is utterly retarded. Emphasis on utterly retarded. We study thoroughly ancient civilisations by digging their fossilised poop and analysing the whole thing in expensive imaging machines that can see through anything in 3D just to determine what they ate for breakfast, yet somehow a very complex planet-wide civilisation would be of no interest to anyone out there? Why? They'd either find a lot of things in common with us or a lot that differs, both of which are very interesting.
In conclusion, I suggest you stop taking your opinion about eventual alien civilisations from science fiction writers with inferiority complexes that stem from their high school days (evil superior aliens = jocks/bullies/mean popular girls).