"relatively easy to fix compared to the immense benefit" is what I said. Even a few percent reduction in cases of these illnesses would likely be worth tens of billions of dollars for the economy every year. And it could also be justified as defense against bioweapons. A hundred billion dollar program to improve cost and establish certifications could easily be justified if efficacy and safety are good enough. And I'm certain at that level of investment (much lower, probably) cost and certification problems would be very solvable.