One of my buddies who does prison ministry was talking about an inmate he met recently. The prisoner is mid-30s with wife and kids. He was about to get out after doing his time. A two-time felon, he was terrified that he was going to fall down again and get sent in for life. Drugs were is Achilles heel, meth and crack.
Just as the human brain didn't evolve to cope with Internet porn, it didn't evolve to cope with drugs, either. For the next 40-50 years, this guy is going to have to find a way to keep out of the clutches of chemicals designed to ensnare him with a brain that has been warped to crave them.
Everyone doing their own thing and discarding objective morality in favor of ultimate personal freedom sounds good until you watch human lives thrown into the meat grinder of drugs and porn. Secular humanist theory falls apart in the face of biological reality.