What is an extremist w.r.t. an ethical system? An ethical philosophy is not some scripture you can interpret and misinterpret.

The existence of extremists implies the existence of moderates. What are they? When their moral code says "Fraud, in this particular circumstances, is good", are they the ones that can't shake off the vice of honesty?

Or are they the ones who use motivated reasoning to bring their moral philosophy to conformance with their instinctual moral feelings?