From NWA to Modern Gangsta rap?

How did gangsta rap(if you can call ross and others that) go from pretty socially conscious like NWA, Tupac, Ice T, and Biggie to this glorification and indifference of modern thug rappers. NWA and others of their eras spoke about the challenges in the hood and said something needs to be done. Now people just say it is their and maybe even glorify it by claiming to have shot someone and laugh. I just wanna know how this could happen where our music went wrong.