马文.盖伊这首伟大的what's going on,表达了什么主题?

Mother, mother
There's too many of you crying
Brother, brother, brother
There's far too many of you dying
You know we've got to find a way
To bring some lovin' here today - Ya
Father, father
We don't need to escalate
You see, war is not the answer
For only love can conquer hate
Gaye Marvin
You know we've got to find a way
To bring some lovin' here today
Picket lines and picket signs
Don't punish me with brutality
Talk to me, so you can see
Oh, what's going on
What's going on
Ya, what's going on
Ah, what's going on
In the mean time
Right on, baby
Right on
Right on
Oh, but who are they to judge us
Simply because our hair is long
Oh, you know we've got to find a way
To bring some understanding here today
Oh
Picket lines and picket signs
Don't punish me with brutality
Talk to me