We do not expect people to be deeply moved by what is not unusual.
That element of tragedy which lies in the very fact of frequency,
has not yet wrought itself into the coarse emotion of mankind; and perhaps
our frames could hardly bear much of it. If we had a keen vision and feeling
of all ordinary human life, it would be like hearing the grass grow and
the squirrel’s heart beat, and we should die of that roar which lies
on the other side of silence.     –George Eliot, Middlemarch

we do not hear the 
frequency of tragedy,
the silence and roar