1) there “always being donation drives” does NOT mean that there’s an unlimited blood supply.
2) imagine your single great-uncle is injured at work and looses half of his blood and is in critical need of a transfusion. Even if there are people willing to give blood to family members, there are times when:
a) family members AREN’T always willing to help
b) family members aren’t able to help (due to time / location / blood type), or
c) there is too much blood needed for one or two family members to provide the donation.
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