Demographic crisis is a major threat. We aren't having enough kids as a society & if this trend continues, we will suffer economic collapse followed by military/political collapse in favor of some other country which solves this 1st.
However, I don't want to sacrifice quality for quantity & have a society overrun with trash people. That will only result in more Democrat voters & our society will be destroyed anyway.
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Any couples statistically likely to be able to have "good" kids who will be productive members of society, should be increasingly compelled by state incentives & coercion to have kids, including banning them from having abortions [with an exception if the kid is a mutant or retard].
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Any couples (or single moms) statistically likely to spawn burdens to society should be encouraged to have abortions at the earliest possible time.
Ideally we'd also kill welfare, but you're certainly correct that it's better for pay for an abortion than to pay to support some whore single mother and her criminal bastard for 18+ years.