The word for damaging something on purpose is "vandalize." Vandalism refers to the intentional destruction or defacement of property, often involving acts that are meant to harm or degrade. It can apply to various forms of damage, including graffiti, breaking windows, or other destructive actions.
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The purpose is to prevent foreign object damage.
The purpose of a French drain is to move water away from your home, protecting it from water damage. You can learn more about french drains at the Wikipedia.
proper
Beneficial
Words such as "duty" or "obligation" are among some of the words that suggest any sort of purpose.