Damien didn't have much of a perspective on the outside world.
He didn't have much contact with it, after all.
In truth, he could solve this problem by going to the Sanctuary, but he didn't do so for a myriad of reasons.
First and foremost, he didn't know how his mentality would be affected by comfort.
He wouldn't break down, he knew he was secure enough to confirm that, but comfort was still the primary cause of contentment.
He wasn't allowed to be content right now. The second he felt comfortable, his motivation would take a hit whether he liked it or not.
The people he loved were the main providers of his motivation, but they also made him want to put everything down and rest.
The Sanctuary was simply too comfortable.
If he wanted to, he could take all his people there and be safe from the current conflict.
The Nox could not reach the Sanctuary.
Why else would it be called that?