We are individuals. "So then, each of us will give an account of himself to God." Rom 14:12
But we are also a community of individuals. We are obligated to preach and teach the Gospel, to care for one another and to restore and correct one another, to love one another:
"It is actually reported that there is sexual immorality among you, and of a kind that even pagans do not tolerate: A man is sleeping with his father’s wife. And you are proud! Shouldn’t you rather have gone into mourning and have put out of your fellowship the man who has been doing this? " 1 Cor 5.
Part of being an individual held accountable for the truth means we will be asked how we shared that truth with others, others who were drowning in their own sin and needed someone, anyone, to help them.
I'm not guilty for the sin of another, but what if I neglect an obligation to aid or to "save others by snatching them from the fire"? Jude 1.
Rom 14:13 "Therefore let us stop judging one another. Instead, make up your mind not to put any stumbling block or obstacle in your brother’s way"
Instead of judging one another, ask how we better encourage one another and lead one another away from sin and into grace and repentance.
Rom 15:2-3 "Each of us should please our neighbors for their good, to build them up. For even Christ did not please himself but, as it is written: “The insults of those who insult you have fallen on me.”"