Pigs and swine flew

Do you know that just because of the swine flew farmers are killing there pigs I don't think that's right because the regular flew is bigger then the swine so people who died with the swine flew is because either they have a sickness already or they are preagnet or possibly if there a baby just born. So for farmers that are killing pigs I think you should stop because its not there falt please comment if you think this is right or not right.