Counter invasion? Counter to what?
Thargoids? I don't think this has anything to do with them. The old woman says (and I paraphrase) what is out there is far worse than the Thargoids, so I don't think it would be them. And if 'someone else' is out there, it is us going to them, not vice versa. If anything 'they' might see us as invaders. Especially if we employ the same strategy we have with the UAs and Barnacles: Destroying them.
Think carefully about who might be perceived as the instigators and aggressors. You are in danger of adopting a very 'Federation' line in your thinking.
Agreed.
Also, if Thargoids eventually turn up on our borders, they may not necessarily be invading us.
They could be fleeing something.
Remember what the old lady said in Elite: Reclamation? "...something far worse than the Thargoids lurks within the Formidine Rift"
Thargoids aren't stupid.
If you can't fight the dragon, and can't out run it, lure it to another victim as you quieltly slip away into the night.