I have corrected my posting above because when I approached the battle cruiser it was just in line of the Thargoid jump signal. I've got the wrong scan. Shame on me.
As I (and others) wrote in another thread: we humans are not primarily their main target at the moment. They are looking for something. Evidence: the selectedly destroyed containers aboard the not completely destroyed megaships, the attacked but not destroyed spaceports, the INRA bases. They are alien and know about their strength. We are blowflies for them - we are annoying for them, nothing more at the moment.