2+2=?

yes it's true i am a young man, but i'm old enough to kill, i don't wanna kill nobody, but i must if you so will, and if i raise my hand in question, you just say that i'm a fool, cause i got the gall to ask you, can you maybe change the rules, can you stand and call me upstart, ask what answer can i find, i ain't sayin' i'm a genius, 2+2 is on my mind, well i knew a guy in high school, just an average friendly guy, and he had himself a girlfriend, and you made them say goodbye, now he's buried in the mud, over foreign jungle land, and his girl just sits and cries, she just doesn't understand, so you say he died for freedom, well if he died to save your lies, go ahead and call me yellow, 2+2 is on my mind, all i know is that i'm young and your rules they are old, if i've got to kill to live, then there's something left untold, i'm no statesman i'm no general, i'm no kid i'll never be, it's the rules not the soldier, that i find the real enemy, i'm no prophet i'm no rebel, i'm just asking you why, i just want a simple answer, why it is i 've got to die, i'm a simple minded guy, 2+2 is on my mind