Interesting thoughts, as always from you Carolyn, thanks for posting.
The way I think about it, is we have to start by questioning our own hostility, what is behind it, what drives it, before we can consider what might drive others.
To me, hostility is an animal territorial/survival response, caused by actual scarcity, or a percieved scarcity, or a perceived pending scarcity.
I believe we act with hostility to try to grab as much as we can for our own personal survival, just like any animal will do in the same situation.
All of the traits of colonialism, profiteering, possessiveness, monopolisation, slavery, warfare, yada, yada, of all imaginable variations can be traced back to the same basic issue, as far as I can see.
Those are just mis-applied human ingenuity, to the animal instinct, I believe.
When we see this clearly, we see what we need to remove from our minds, in order to remove its influence on our thoughts, I would say.
Not easy! It is very easily forgotten, in the heat of things, in my experience.
But with that removed, we look at what needs to change in human life, for it to perhaps become the norm; human economy.
We maybe see that there is infinite wealth from the sun, which has been largely ignored, in our frenzy for profit (Before Bitcoin, as I've covered elsewhere).
When we realise that saving ourselves, and our planet, depends entirely on whether or not we successfully utilise the wealth of our local sun, not only for us, but for any would-be extraterrestrial species, we start to imagine how life without scarcity, and thus how life without profit would be, and then, finally, we are ready to consider the mindset of would-be alien civilisations that might be technologically advanced enough to come visit, I would say.
That done, it seems hard to imagine why there would be any hostility, other than perhaps defence from ours, which will die with us, bound to our planet in extinction, unless we learn to control our hostile animal instincts as a species.