Under strict reciprocity (Tit-for-Tat), actors calibrated strikes to mirror adversary actions, preserving a tacit ceiling. When leaders declare "the era of proportionate response is over", they seek to establish deterrence by punishment: guaranteeing that any initial provocation will be met with disproportionate cost imposition.
Disproportionate doctrine inherently accelerates ladder climbing. By skipping intermediary rungs (e.g., answering proxy attrition with direct sovereign ballistic barrages), adversaries compress diplomatic off-ramp intervals, increasing reliance on pre-delegated launch orders.
Clear tripwires warn adversaries of immediate retaliation thresholds, but leave actors trapped into executing escalatory actions to maintain deterrence credibility. Ambiguity preserves flexibility, but invites miscalculation under high friction.