Sforno on Deuteronomy 32:27/ספורנו על דברים ל״ב:כ״ז

1לולי כעס אויב אגור, that on account of the violent anti-semitism which the gentile nations would unleash against the small remnant of Jewish people so that in order to save themselves from further persecution they would פן ינכרו צרימו, attempt to divest themselves of their Judaism altogether, something the gentiles would hold out to them as a lifesaving gesture,

2פן יאמרו, and lest the gentiles would approach these remnants of the Jewish people saying to them

3ידינו רמה, “we have prevailed, we have proven right with our religion, our faith,” and

4ולא ה' פעל זאת, “this was not what G’d did to you for not obeying Him,” so that you would still have hope to escape your fate by doing teshuvah. G’d scattered you to so many different places on earth that the total oblivion of the people through assimilation by inducements of the gentiles would not be likely. This was what Devorah meant when she said in her song in Judges 5,11 צדקות פרזונו בישראל, G‘d performed righteous deeds when He scattered Israel (instead of sending them to a single country into exile)