this is where subsets come in. because if you have the same illness that i have, you didn't inherit it and genetics mean nothing. you got coughed on or sneezed on, or kissed an infected person, or maybe drank from the same glass(ingested saliva).
unless someone knowingly infected you, there's no sense in Blaming anybody. just the same as you gave it to somebody else before you knew what it was, it's not your fault. that's why once we understand that we have a contagious condition, we must do our best not to infect others. This isn't so easy, but it has to be tried.
Blame and guilt are best avoided in our situation unless you know that another person intentionally exposed you.
if you don't have my subset, maybe you did inherit something. parents who have a disease and still have kids are responsible to those children when the inherited stuff comes out. whether you blame them or they feel guilty are personal choices.