Well... let me get it all straight and simple. Xenos and XA particularily are hostile to everyone that are not explicitly neutral or friendly.
If someone doesn't bother contacting us and trying to convince us not to shoot him, we will shoot him, destroy his assets, kill him, his family, his friends and his pets. And spit on the rotten corpses.
I have put a lot of effort to give everyone all the possible opportunities to contact us.
How come a guy got his base blown up four times in a row and he didn't figure to contact someone BEFORE building a base?
We will never ask who owns a base we come across. Because if we are not aware of it's existence, it means it's hostile.