If A can die from sesame seeds and B can't and the A-to-B ratio is something like 1:1e+6, doesn't it make more sense for A to bake their own bread instead?
Most bread types don't contain sesame seeds so why let the sesame seeds contaminate them and cause life-and-death situations?
Proposed legislation: allow large-scale production and sales of sesame seed bread only if you produce and sell more sesame-free bread.