Your talking about imprinting of fear/phobia..
No it had to be done.
Too many people are blaming "conditions" that they may not qualify for to have a pathological fear (you need to qualify under a DSM-IV criteria).
Most people have a managable fear.
"I have low blood pressure" - CHECK with the nurses there!
"I faint when I see needles" - Do not ever get sick and end up in hospitals so many syringes.
"I have AIDS, HEP C or B or other blood borne disease"- Ok thats fair enough.
i don't think that 93% of the population suffer what your trying to explain and of them i think at least 20-30% of the population is eligible to donate. I just think that the 95% should just go and get screened and if they can, they should, doing a good deed for another.