A plain reading of the letter indicates that the Thessalonians were being persecuted by “ their countrymen” who were Pagan, not Jews. Paul is pointing out that HIS countrymen, who WERE Jews, opposed him in the same way......... by holding on to their old teachings.
I suggest that you have a corrupted English translation of the verse.
King James Version: "... the Jews, Who both killed the Lord Jesus, and their own prophets, and have persecuted us; and they please not God, and are contrary to all men."
Douay-Rheims Bible: "... the Jews, Who both killed the Lord Jesus, and the prophets, and have persecuted us, and please not God, and are adversaries to all men."
If you insist on a more modern translation, here's how the
International Standard Version has it: "... the Jews, who killed the Lord Jesus and the prophets, who have persecuted us, and who please neither God nor any group of people."
