If we belong to God, there is nothing Satan can do that will remove us from God. We have a tempter, but we do not have an accuser. God's justification makes it impossible for us humans to be each others judges. Satan cannot accuse the person in Christ, and people cannot judge the person in Christ. Justification destroys Satan's power to condemn.
Justification destroys people's right to judge.
No, it means quite the opposite. Justification is not a license to sin. Justification means God did for us in Jesus what it was impossible to do for ourselves. We are totally dependent on God's forgiveness. God knows the heart, knows the struggles, and knows our motives.