I realize we're just chatting and not acting as Teachers, but I want to encourage that we study these terms. Without studying the scriptures (by which you show yourself approved unto God), your conclusions will always mislead you.
God would be redundant if iniquity, sin and transgression were all the same which is not his style. His words are precise and explicit, leaving no room for confusion. He says exactly what he means.
From what I've found, when he speaks of workers of iniquity, they are not just servants of sin. They promote destruction through deceit, influencing people to believe lies about God and Jesus.
Psalm 14:4 Have all the workers of iniquity no knowledge? who eat up my people as they eat bread, and call not upon the Lord.
Psalm 64:2 Hide me from the secret counsel of the wicked; from the insurrection (a violent uprising against an authority or government) of the workers of iniquity:
Workers of iniquity are specifically against God, against the truth, as oppossed to a brother trespassing against a brother or neighbor. It's like they work on behalf of Satan, deceived and deceiving others. And in these times there are many who do, who come in Jesus name, to whom Jesus will say I never knew you.