By the middle of the 1970's, music had changed it's messages back to the carefree relationship songs that were the "popular" songs of the previous era's (also known as the beginning of the "not interested thank you, I have to look after myself" years, and later known as the "80's").
My age group were the misfits who started punk bands, sticking needles in and spitting out anger and anarchy. It was a rather less sophisticated attempt at suggesting changes were needed in our society than previous prophets had preached.

Today we live in a time when news travels in nano seconds yet we know less about the world than we did 150 years ago when the Morse Code started the communications revolution.

These days our artistic communities are all tied up trying to make money or get funding and have little time to question big brothers handling of our celestial jewel.
I'm not saying that the many charities and benefits that many many musicians and artists have been involved in for decades haven't been valuable, I'm talking about discussing the real issues that effect us, our rights, and the way our countries and our world are being run.
We should be working to make things better for everyone, not chasing the golden egg and occasionally sending band aids to people who are being killed with our own guns.

Can you imagine Britney Spears singing about prisoners rights...in a prison!

Links:
Universal Declaration of Human Rights
Morse Code Trivia