The topic sums it up. Imagine we are discussing the points of view(s) of a population.
I often say "From their perspective, minimum wage is a good thing." However, if they all have perspective, should the correct form not be, "From their perspectives, minimum wage is a good thing."
Notice that although there is only one perspective, each of them has this perspective, thus resulting in the same, but many of the same perspective. Would both of these work?