The reason listening to all forms of music can benifit you production is if you understand how a piece of music works you can then use it in your own way so if you want to make a techno track jazzy or whatever you know how to do so and what elements are needed ect.
Other forms of music help you to see a bigger picture while life,oppression,the machine,human nature and the way of the world ect are for insperation(as you said)

Inspiration gets you started but knowlege helps you to carry that inspiration on to somthing more.