Why does MN 117 refer to a dirty defiled (กิเลส) right view of bondage?
In Pali text, it  says  sāsavā, not  asāvā.  Because there are no direct translation of both words to English that would capture meanings and differentiate them at the same time.  The translator tried his best to preserve original Pali text.  A new word in English may have to be invented.

Maybe "still a taint" is another option for sāsavā?


  ...And what, bhikkhus, is right view is still affected by the taints 
  ...
  
  ...Katamā ca, bhikkhave, sammādiṭṭhi? Sammā­diṭṭhim­pahaṃ
  , bhikkhave, dvāyaṃ
   vadāmi—atthi, bhikkhave, sammādiṭṭhi sāsavā puññabhāgiyā upadhivepakkā;..... 


there is no direct translation to english for sāsavā . But I understand this word as "positive attachments to mind, things of good merits", quite opposite of asava, negative attachements to mind).  However, any attachment; positive or negative is still a taint (asava)

Where further in this sutta "anāsavā lokuttarā", i understand it as positive attachments to mind that noble disciples know they need to let go. 

They are 3 different key words in this sutta: 


sāsavā
asava
anāsavā