reasonable?! that sounds a little off considering that in 1918 non essential businesses were closed and see the contrast between Philly and St Louis in 1918. From what I have read it seemed to be standard practice.
Herd immunity as I understand it can only work if society is ready to accept healthcare being overwhelmed and all of its repercussions. Of course, it is also assuming that one cannot get reinfected which no authoritative source is ready to say.
I find this thread to be incredibly informative both the dialogue and identifying some of the media and governmental biases.