Sforno on Genesis 50:20/ספורנו על בראשית נ׳:כ׳

1ואתם חשבתם עלי רעה, you had mistakenly considered me as a רודף, someone threatening your very lives. Had you not erred, your actions would have been perfectly justified.

2אלקים חשבה לטובה, G’d exploited your error for something good.