Sforno on Genesis 42:21/ספורנו על בראשית מ״ב:כ״א

1בהתחננו אלינו ולא שמעבו. This made us guilty of being cruel against our brother, even though we considered him halachically in the category of a רודף, someone threatening us. We should have reacted with pity once he started pleading with us. Now, we are being punished by being treated cruelly ourselves by the ruler of this land.