And to do that effectively you often have to show people why they need a savior - ie. show them what they are being saved from.
True - the Bible also explains that under the Old Covenant.
We asked for the Commandments and He said, "if you insist" and sin grew throughout the world.
There's nothing wrong with talking about the alternative to accepting Jesus but He and His loving sacrifice are the real news that needs to be preached. Focusing on the consequences has a history of turning people away because all the "fire and brimstone" messaging makes folks feel like they are already doomed so what the heck....too many who carry the message of Hell forget to mention that they too are sinners and only redeemed through His Grace. Being preached to by those who often set themselves above the fray has negative consequences.