That isn't surprising. If people think they can tough it out, either through being young and healthy, already having had it, or are an anti-vaccination proponent.
All of those combined becomes a decent sized group of people. The question is, are they right to feel this way? (probably not in the antivaxxers case)
"I can tough it out because I am young and healthy," is equivalent to, "I don't care if I happen to pass it to someone else, and they die." So, that's not really a solid position to take.