That I can agree with you on. It is very unfortunate that Impressive carried this disease. Nevertheless, he has had a great impact on Qhs, Paints and Appys. I, ashamed to admit it, was one of those that knowingly bred HYPP positive horses, because I WANTED a positive horse. I have owned my share of positive horses and I am ashamed at myself for doing such breeding. However, I can totally understand why it continues. Do I still do it, heck no. All of my horses are tested negative. And I will only breed negative horses.
But it is also shameful that Impressive and Impressive bred horses are faced with such a reputation because of HYPP. I know several people throughout the US that will not have anything to do with an Impressive horse, regardless of being N/N or not. Unfortunate that ignorance abounds.