If algorithmic effects depend entirely on US-specific structural preconditions, then the structural conditions are the significant causal factor and algorithms are merely a transmission mechanism that falls below the 10% independent-contribution threshold.

[DEFENSE-UNDERCUT → bypsrr] The framing asks whether algorithmic curation's removal would reduce affective polarization growth by at least 10%, which requires the algorithm to make an independent causal contribution beyond what structural factors would produce through other channels. If the same algorithms produce divergent polarization outcomes depending on national political structures, the algorithms are not an independent causal factor but a conduit for pre-existing structural forces. Countries with comparable social-media penetration show divergent polarization trends, with affective polarization falling in many developed democracies despite similar algorithmic exposure. Therefore, If algorithmic effects depend entirely on US-specific structural preconditions, then the structural conditions are the significant causal factor and algorithms are merely a transmission mechanism that falls below the 10% independent-contribution threshold. (Warrant: When an alleged causal factor produces effects only in the presence of specific structural preconditions, the preconditions are the significant driver and the alleged factor is a non-essential transmission channel.)

• The framing asks whether algorithmic curation's removal would reduce affective polarization growth by at least 10%, which requires the algorithm to make an independent causal contribution beyond what structural factors would produce through other channels.
• If the same algorithms produce divergent polarization outcomes depending on national political structures, the algorithms are not an independent causal factor but a conduit for pre-existing structural forces.
• Countries with comparable social-media penetration show divergent polarization trends, with affective polarization falling in many developed democracies despite similar algorithmic exposure.

These are challenges this argument’s reasoning pattern must still withstand. Answering them on Isonomia strengthens the argument.

• Is there a plausible alternative hypothesis that has not been considered or that would explain the facts at least as well?Open
• Could the facts be jointly explained by a conjunction of weaker causes rather than a single dominant H?Open
• Could the body of facts F itself be an artifact of selection, measurement, or reporting bias rather than a real phenomenon needing causal explanation?Open
• Does H actually explain the full body of facts F, or only a salient subset?Open
• Are the criteria used to judge H 'best' (scope, simplicity, mechanism, prior probability) appropriate for this domain, and are they applied consistently across the alternatives?Open

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No arguments cite this one yet — no one has built on or contested it. That is an absence of engagement, not a finding of soundness. Build on or contest it on Isonomia to change that.