Joseph!
1. Yes, people would rather have a job by such an employer than not to have one. It was especially true in earlier times when having a job meant having bread on the table to survive. SECONDLY, as DY wrote this employer needs to really check his level of ahavas Yirsoel and ahavas Geirim. Are these mitsvos as far as you go?
Neville CB, if one of the parents is indeed an FFB, I am not sure you arer right. If the FFB parent is actually an KFB (krum from birth — born in a frum family, but lacking Yiras Shamaim), you are for sure wrong! And there are many KFBs around. Also, if many people (often times, for krum reasons) “prefer” FFBs, that kills shidduchim for BTs. Paining another Yid not for a valid reason is an aveirah. And how about “closing the door in front of Ba’alei Teshuvah” and placing people at risk of going of the Derech?