Earlier quoted context omitted.
If you still think that population size is relevant to the point, the contrast is still lost on you.
Imagine 10% of your community dies a year. Now imagine 0.1% does. Do these differing percentages make any difference to your sense of urgency and willingness to fight the problems causing those deaths? No? Well ok then.
I'm not saying the percentages aren't relevant to the larger discussion, but the membership in a community point is also relevant, and doesn't require the percentages to be a valid point that stands on its own.