Jesus was speaking to Israel. The command is for Covenant brethren of the twelve tribes of Israel to love their brethren of the same tribe and their neighbor of another tribe.Jeremiah, He said, "Love those who persecute you." It was not only the Jews who persecuted Christians, but the Gentiles as well. You are changing the verse into saying, "Love the Jews who persecute you to death, but hate the Gentiles even if they treat you like their best friend," Lol.
When Jesus said this only Israel were Christian who waited for their Messiah/Christ.
I don't know who in Israel would eventually be saved because of the Work of Christ on the cross."Enemies at most..." How bad does it need to be? They blasphemed Him, they accused Him of sorcery and serving Satan, they plotted to have him murdered incessantly, and eventually had Him crucified. You are saying these people were loved by God whereas the Gentiles - like the centurion whose daughter was healed for believing in Christ's authority - were hated?
But at least 3000 Jews Peter preached to became saved. I'm sure there were some in this crowd that cried out "Crucify Him!" I'm also sure the darkness for three hour in the land before Jesus expired would have brought terror and change of mind to many. Even the centurion said, "This truly was the Son of God." A centurion, mind you.
According to Scripture a centurion love Israel, even built them a synagogue - possibly with his own money or with his own hands.
I will bless them that bless thee and curse them that curse thee, was the promise to father Abe.
Although God used as instrument for his purposes the Roman legal system it was God who smitten His Son according to Isaiah.
No one took His life. He laid it down. And He took it up again. So, how can anyone be held guilty for the death of the Son of God.
God would not allow a mere man or mob of men to kill His Son. This was an act of God, not men.