system
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human
[star wars] why are the Yuuzhan Vong invisible to the force.

I have been in a number of discussions about star wars, usually in conjunction with other settings in which the Yuuzhan Vong are mentioned and i have gotten several different reasons for their force resistance. the wookieepedia article claims it is because of their violent behavior and destruction of other races.
gpt
The YV originally came about on Yuuzhan'tar, a living planet. It was slightly different from most planets in that it was sentient, thought it was pretty (Because it had a shiny asteroid belt around it) and could do something unpleasant to you if you tossed that can out the window while doing 90 down the highway. The YV were connected to it, always.

So the YV were hanging around and having a good time, being YV, and everything was great. Then the droids attacked and everything went to hell. After being beaten back on all fronts for a long time, the Planet finally decided "Hey, you know what? Here. Just take this and go away. Please stop them from strip mining me, too, kthx." and taught them how to make bioweapons - the first step along the path to changing from these ur-Vong to the modern day Vong.

But the war dragged on even with that, the species changed, the culture changed. They became violent and warlike and generally unpleasant, slowly transfiguring into the Battle-Mormans we know today. But they won, and drove off the droids. And were then at a loss of things to do. So they proceeded to spread the good word by destroying any mechanical technology they could find in their Galaxy. The rest of their slaves (and future slaves) sort of didn't like this idea of being slaves who could never possibly rebel and elected to fight back.

This resulted in a war that destroyed their homeworld of Yuuzhan'tar. One they won, but at a terrible cost. The symbiosis with their homeworld was broken, a connection they'd evolved to have. Every member of the Yuuzhan Vong was blinded to the Force by the pain this caused at every level of their being (And is sort of responsible for their fetish for it, since, you know, they want that symbiosis back at their most primal levels. They just don't know it).

And that created the modern Yuuzhan Vong. Battle hardened, blind to the Force, pained at every level of their existence and bent on spreading their biotechnological ways as a homage to their dead Home and to prevent their own near genocide from ever re-occurring.. Two of the YV are known to have been Force-Sensitives: Somehow they looked past the torn connection and reached out into the web of life.