The only way that could conceivably work out is if everyone collectively protested their student loans together since it’s such a massive problem for so many people. Even then, the government would probably buckle down and try to destroy half the country’s financial viability before they caved and admitted this toxic industry preyed on kids that didn’t know what that debt meant when they signed up for it.
Most of the world actually has legal marriage between first cousins. In many places it’s not even taboo. And on top of that, the chances of genetic issues with it are actually pretty small. It’s multiple generations of first cousins having kids where it becomes a problem.