Ferminal said:
You have to believe you are committing a "wrong" in the first place for it to affect your conscience. Many believe they are doing something normal. In any case, there can't be many people who assign an infinite value to conscience (and norms, rules, altruism etc) so as to completely dominate their decision making. It doesn't help when doping is not condemned by their peers.
Peer doping doesn't have a lot to do with conscience formation. But, rather, situational ethics.
Conscience requires compassion, sympathy and empathy.
Notwithstanding heavy church doctrine (Google: Conscience formation) about how conscience can only be developed and sustained through strict devotion to scripture, conscience development is largely formed during the first three years of life.
So, let's just say some people might be a product of less than desirable family situations. There may not be enough scripture to read for them to right the wrong.
More to the point, some people's lack of conscience allows them to set a doping example for their peers to apply their own situational ethics and wrestle with their consciences.
Dave.