Try out some of the DLC's

its good fun....
Heres a True story the 1st time I played Honest Hearts DLC we got attacked and I got trigger happy as you do then another just past a bridge started shooting at me so i shot him then another from behind him came so i shot him without thinking... He was Friendly
I didnt know that so I Slaughtered everyone in both camps and left again

and was like wait what? that was a short DLC... like 30 mins...
Then i reloaded my save before i went in and the friendly killed the one before i did and then the convo opened i was like... im an idiot