To be of "good conscience" means to be free of any feelings of guilt or wrongdoing. Thus, anyone who declares that the peck can be taken in good conscience either does not recognize the obvious wrongness of the peck and everything associated with it or refuses to acknowledge this wrongness as wrongness.
To claim that Christians can take the peck in good conscience is to claim Christians are free to engage in an obvious immoral act without the need for acknowledgement, let alone repentance.
Let's be clear. Christians who have taken the peck must not deceive themselves into believing that they "did the right thing".
No matter what the circumstances, getting pecked is the wrong thing. Thus, a Christian who has decided to get pecked or who has been "coerced" into getting pecked is not at liberty to file away the matter under "good conscience."
Regardless of the circumstances involved, accepting the peck should induce bad conscience - the knowing or thinking that one has done something bad, wrong, and immoral. The action should produce some sense of guilt.
Guilt is a moral emotion. It tends to surface when you have compromised certain standards of conduct or when you have violated moral standards. The deepest form of guilt for Christians occurs when they compromise and/or violate God and Creation. Compromising or violating God and Creation includes compromises and violations against the Divine Self.
All attempts to flip bad conscience to good conscience solely via reason and the intellect (prudence) only serve to increase and expand bad conscience.
The only way to flip bad conscience to good conscience - to be redeemed from guilt and sin - is through repentance. And that repentance has to come from the heart. From thinking that emanates from the heart rather than the head.
But repentance requires the acknowledgement of sin, and sin can only be acknowledged once the illusion of good conscience is recognized for what it really is - an illusion.