For Truth's sake, that is. Two articles that every freedom loving person should read: Vaclav Havel's essay and Spiked On-Line.
There are so many things going on in the culture to stamp out truth and force conformity that to agree with sin really isn't brave at all. To stand against sin is much more brave because it is dissent in the face of a lawless and sinful culture.
Everyone has the right to sin as big and bold as they choose. They do not however have the right to determine the consequences or demand no consequences for their sins. Also, they have no right to not be judged rightly by God's standard of truth for those sins.
Make no mistake, God will not be mocked. We will all be judged. The question comes to Who will take the punishment? Jesus has taken it all ready, but each individual must decide to accept His sacrifice or take the punishment himself.