000646- anyone that has some feeling within, feels bad for the family/community they left behind. They might be happy with their new life but if they’re just a bit sensitive to others, they will have a tiny bit of a guilt feeling for what they did.
About your other question, if someone doesnt believe in Hashem and the Torah, then you’re right, they might think that being non-frum is just as good.
But anyone who goes off the Derech and still believes that Hashem is there…or that the Torah exists for others- not for me- cannot deny that being frum is right. Because we have it spelled out clearly in the Torah each Mitzvah and exactly how we must act. If you believe in Hashem and the Torah, you MUST act that way, with no choice in the matter- That’s what a Jew is all about.
A Jew that still believes in the Torah but doesnt keep the Mitzvos for whatever reason, knows the truth that being frum is the real thing. Doesnt mean they do what they truly believe is right. But if they really dont believe that the Torah way is more right than their new way, then they are denying Hashem and his Torah.