Well, no, I don't buy into all of the problems being part of some huge conspiracy by the military/industrial complex.
First of all, humans were killing each other and/or at loggerheads over territory, religion, ethnicity, tribe, class, property, etc. long before the manufacture and sale of weapons ever became a business. We're just continuing a long and storied history of people hating on each other for whatever reason they can come up with.
Secondly, power and money go hand in hand. Other than ideologues, people generally want power in order to gain wealth, and to some extent vice versa.
The percentage of various countries' GDP spent on military stuff is just not that large.
The Biggest Military Budgets As A Percentage Of GDP [Infographic]
If the military/industrial complex was really controlling the world, one would expect them to be much more financially successful than they in fact are. Look at the chart here
Economy of the United States - Wikipedia (sorry, it's U.S.- centric, but the U.S. is a considerable producer of weapons.)
Then let's look at the 500 wealthiest people in the world and the sources of their wealth:
Forbes Billionaires: Full List Of The 500 Richest People In The World 2016
The way to become really, really rich is not by participating in the military/industrial complex. If the people who are part of the military/industrial complex really control the world, it beats me what their motivation might be, since it's certainly not money.