

I see it as an extension of the myth of American purity and external corruption. “This person is evil, some outside power must have compromising info on them.” “Immigrants are violent criminals preying on innocent americans.”
These attitudes ignore the reality that bad people can come from anywhere. There are plenty of villians with very mundane origin stories. What matters is if everyone else has the will and ability to keep bad people in check and hold them accountable.
The grifters in charge need no other motivation than a sense of superiority and an opportunity to make a buck.
The other benefit I can think of is keeping the fissile materials always sub critical. You don’t have to worry about a meltdown if the reaction is not self-sustaining. It’s an odd marrying of technologies, but I think people are being too dismissive.
Although, I wonder if the true purpose of such a device would be high output breeding of fuel for weapons use.