Why is energy expenditure the metric we're using to judge who should stop? In my opinion the metric should be this: whoever has the highest capability to cause

Why is energy expenditure the metric we're using to judge who should stop? In my opinion the metric should be this: whoever has the highest capability to cause injury to another person should be the one who has to be more careful and considerate. Injury is more consequential and potentially life-altering than energy expenditure. From this perspective, motor vehicles should give way to bikes, bikes to pedestrians.