Before the time of Jesus Christ, working on the Sabbath day was strictly forbidden. But according to the stories, he broke the taboo by doing something, which in his case, healing.
Prior to Abraham Lincoln's freeing of the black people, it wasn't accepted for them to become members of society. Nowadays, they become athletes, artists, musicians, and even leaders. Despite some people still refusing to accept this change, the culture of black people has, without a doubt, gained acceptance to the world.
Before Copernicus and Galileo, people belived that the sun revolves around the earth. Nowadays, people use the globe for obvious reasons.
Previously, it was taboo to cut up a corpse since a body is considered sacred, even after death. But if it wasn't for Andreas Vesalius, who studied and dissected human cadavers, the field of Anatomy wouldn't exist. Without his contributions, the medical field will still be in the Dark Ages.
Previously, it was forbidden for people to think against the teachings of their religion. But today, it is this rational thinking that brings us technological advancements that seemingly make life better and makes us discover what is beyond the world we live in.
Break a few rules, a few little taboos. You'll probably get farther than not. Don't worry. It's not cheating.