Let me turn the question around. Why would someone risk their life for someone that don't even know then put their own family at risk?
Because they are completely selfish and only risked their life to make themselves feel good or to make other people think they are good, but in actuality they don't care about anyone else at all.
You are missing their point. They believe the risk does not warrant the quarantine. You can agree or disagree but let’s not question their dedication.
It is obvious that the risk justifies the quarantine, since one can become symptomatic and spread the disease before realizing it, and may have even rode subways and taken ubers and played bowling during that time. Considering the 50% chance that anyone who catches it will die, and will also pass it on to other people before doing so, and the fact that the disease is not well studied and understood, it is impossible for a rational person to not think that someone who was extensively exposed should quarantine for the incubation period when travelling to a country of 300 million where it has not been spread yet.
The US tells people in Africa that it cannot be spread on a bus, but if you are sick you shouldn't ride a bus because you might spread it. The CDC tells us one day it cannot be spread by a sneeze and the next day that it can. They tell us it can't be spread by touching surfaces, but then a study showed it could live on a surface for up to 50 days. There are a lot of unknowns, and a lot of "unknown unknowns."
At the very least, even if they could possibly know there is no danger (which they cannot know, as above), they should at least acknowledge the discomfort they give their neighbors and family who are in fact afraid. The failure to account for that alone is enough to tar them in by book as completely selfish.
I don't just
question their dedication. I think there is simply no other alternative.
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