The reasons for what is known as civil registration are varied, but in general it was felt, and then demonstrated, that knowing who was doing which to who, and where resulted in not just a more orderly society, but also a more peaceful society where children could be cared for more assuredly.
Not that civil registration was an all encompassing cure for social pathologies, but it helped concerned folks find where the need was greatest.
I"m sure Ron Paul has never thought the process all the way through.
I agree. I tend to think he has not thought many issues all the way through because frankly as an anarchist he could care less of the negative consequences to social order.