In my dream children sing a song of love for every boy and girl The

In my dream children sing a song of love for every boy and girl 
The sky is blue and fields are green and laughter is the language of the world 
Then I wake and all I see is a world full of people in need 

Tell me why (why) does it have to be like this? 
Tell me why (why) is there something I have missed? 
Tell me why (why) cos I don't understand. 
When so many need somebody we don't give a helping hand. 
Tell me why?