Rav moshe (and many other gedolim) were opposed to things like mandating teaching religion in public schools, and other religious issues. Murder is not like that, it’s a basic requirement of the 7 mitzvos which are binding, as is Dinim, the imperative to make laws that enforce the other 6. Tendler would also probably not be in favor of opposing abominable marriages, even though they were the cause of the mabul and would put us all in danger.
Afra lepumei.