You have to remove all subdirectories as well:
Code:
alias imlazy {
  var %dir = $1-
  var %a = $findfile(%dir, *.*,0,remove $shortfn($1-))
  var %b = $finddir(%dir,*,0,rmdir $shortfn($1-))
  rmdir $shortfn(%dir)
}

$input(Me like stars, You too?)