NOSAS antinomian position projection.
OSAS claim they are sinners who fail the law, so rely on Jesus to cover their sin, while continuing to sin and being bound to it.
NOSAS by denying they continually sin, dilute the measure of sinful behaviour, so making morality none existant, or Antinomian.
Now a moralist, someone who holds morality has value, no matter how poor a morality is by definition not Antinomian.
If OSAS believers hold there is no law against which they can be judged, on any moral scale, nothing they do is lawless or immoral, that is an Antinomian faith. As soon as you have a moral view of behaviour you have become a moralist. If one gets upset being called immoral or lawless, it actually means emotionally you are a moralist. If one is arguing levels of morality, then you have to pin down the framework, or one is just fudging the language, and deceiving oneself.
Now I could be wrong, but this seems to be the issue. Now those who hate legalism, laws without mercy or love, abandoning morality is a cliff one does not want to go over, because that is chaos and anarchy.