i think ENTP morals are maturity-related. when young (teens), tertiary Fe makes us acknowledge and aware of the affect our behavior has on others, but not compelled by it one way or another, it is almost just plain cool to have the ability to change the inner workings and states of others for... well, fun. i think it is common for ENTPs at that stage to experiment with manipulative behavior.
however, with time and continues relationships we learn the practical value of honesty with yourself and others, and as our Fe matures in our twenties, our capacity for moral thinking skyrockets, because unlike many Fe>Ti doms who might be more sensitive to other's feelings to began with, we have a distinct advantage in trying to see what is happening practically to all agents involved rather then settling down on how things socially appear to be, thus helping us to avoid moral hypocritical judgement. this can be a bit crippling if you let your Ne get the better of you and consider all the ways people can get offended and hurt, which is why i think it is very common for ENTPs to be more selective, tribal and relationship oriented, in determining whose feelings are important enough to put on that heavyweight care-pedestal.
in general, i think as an ENTP, morals are less intuitive for you, you practically need to figure them out on your own, but when you do, they are strong. perhaps one of the most common lines of thought for a maturing ENTP is to look back and think "i was such a jerk" (half guilty, half nostalgic about the freedom).
as for Fi and "non hurting people related morals", its in our shadow functions, we lean on it when we are at the most emotional stress, and nothing good ever comes out of that state.