The purpose of a cancer hospital is to cure two-thirds of
cancer patients.
The purpose of the Ukrainian military is to get stuck in a
years-long stalemate with Russia.
The purpose of the British government is to propose a
controversial new sentencing policy, stand firm in the face of
protests for a while, then cave in after slightly larger protests
and agree not to pass the policy after all.
The purpose of the New York bus system is to emit four billion
tons of carbon dioxide.