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This page in a nutshell: Userpages are not guilty of the sins of the creator. Going through and deleting all of a blocked user’s personal pages is gratuitous WP:RAGPICKING
When a user is blocked, it can be tempting to take WP:DENY to ludicrous extremes by trying to obliterate any trace of the user outside of constructive projectspace edits.
However, if the content in your crosshairs is completely inoffensive, this is a bad idea for several reasons:
Banned users are not outlaws. They are guilty of the WikiCrimes they were blocked for and nothing else, and there’s no need to use them as punching bags when they can’t fight back.
It comes across as a petty and spiteful symbolic gesture and can be more disruptive than the actual user’s behavior.