People have different sins. Some people have sin of voracity, while others commit adultery. The ones who are voracious maybe are not inclined to adultery. For them voracity is something completely normal, while the adultery is sin. For others voracity is disgusting while adultery is their meaning of life... While some people look for salvation in belonging to their church, others do not mind belonging to the church because they are arrogant etc.

Everyone is inclined to justify his own sins and at the same time ready to remonstrate the sins of others. It is normal that everyone accepts such philosophy of life that justifies their own sins.

To justify the rejections of the absolute truth which would otherwise reprimand him for his sins, he forms the understanding that the truth is relative, so, by that, he soothes his conscience before his free choice.

"Ah, you who call evil good and good evil, who put darkness for light and light for darkness, who put bitter for sweet and sweet for bitter!" (Isaiah 5:20)

People are inclined to remove the consequences of sin in different ways; psychological tension, guilt, etc. It shows that people differ not only in their sins but also in mechanisms they use to remove the consequences of sin and thus they differ in excuses which they use to justify themselves. That's why there are so many different life philosophies.

"The time will come when people will not put up with healthy teaching. Instead, following their own evil desires, they will gather to themselves many, many teachers to say what they want to hear." (2 Timothy 4:3-4)