This is the taste of their own medicine. I just remembered a couplet by Saint KABIR. " KARTA THA SO KAR RAHA,AB PAACHE PACHTAYE,BOYE PAIDH BABOOL KA, AAM KAHAN SE KHAAYE " (when you were doing you never thought about your evil deeds,but now you repent.Since you have planted the thorny Babool tree,then how could you can have mangoes.