You can't justify a bridge by the number of people swimming across a river.
https://www.reddit.com/r/fuckcars/comments/xj99do/you_cant_justify_a_bridge_by_the_number_of_people/
When a measure becomes a target, it ceases to be a good measure.
In other words, when we set one specific goal, people will tend to optimize for that objective regardless of the consequences.