The only sects who could have taken in the Wen survivors without having to fear political devastation literally were the Jins (lol) and the Nies.

JC was in the process of building the Jiang Sect from scratch; he had ZERO political influence, no way he can do that without having to fear for everything he has left.

LXC was, at that point, a relatively fresh sect leader and at tops like, 22? With a sect that had been significantly weakened even before the Sunshot Campaign.
So his power was pretty limited.

The only one who had the strength and experience to stand up for the Wens against Jin Guangshan was Nie Mingjue and he didn't.