That seems like a false equivalence as perhaps the requirement to add a SSN for children was precisely because there was evidence of the fraud. In US elections

That seems like a false equivalence as perhaps the requirement to add a SSN for children was precisely because there was evidence of the fraud. In US elections there are fraud monitoring systems in place and there's a lot more anti-fraud and ballot checking processes than using an honor system to count your dependents on a tax form. In general, especially legally, evidence is required to prove the merit of a claim, not to refute a claim. Proving a negative is often impossible, impractical or oppressive.