For those of you who read Hebrew:
There is a good book on the authentic Jewish attitude toward Gerim:.
גרות וגרים בהלכה ובהגות
Conversion & converts, in Halacha and Jewish Thought.
It is a small book (we have it) but it contains very helpful material, emphasizing the positive attitude to Gerim.
Attached are photos of the cover and initial pages.
Written by a veteran Israeli Rabbi, Zecharia Avigal, and with approbations of well-known orthodox Rabbis. Avigal himself is brother of the highly respected Rabbi Yoram Abergel Z"TL, who was famous for his great love of all Jews.