How war helps capitalism?

Capitalist calls upon the poor and oppressed of his own homeland to combat the insurgency. Words like terrorist, Radical Islamist or "a commie" might sound synonymous. People who could relate to those terms serve as the basic pool from which soldiers may be drafted into the imperial armies, the workers from the imperialist powers are thus doubly important to capital. This also signifies why most of the youth find armed forces as their last resort for better opportunity. Fear and dislike of the poorer must be cultivated. Though largely psychological in origins and effects, we can sense them via social discriminations like

racism a kin to nationalism and also fascism. This fear though superficial has a realistic base as well, In competition between the labourers of the same working class. A great example is the members of the reactionary group called the TEA party of the US.
Usually the better paid workers of a great power prize their relative affluence. They fear the reduction of the value of their labour-power which the competition of poorer foreign workers threatens. Therefore, there is a general consent of rejection among the right-conservative leaning politicians for any reformation when it comes to immigration.Jealously eager to preserve their hard-won pay gains-as well they should be!-better paid workers(still working class) too often direct their fire not against the bourgeois and his fellow capitalist-the enemy- but against the poor paid workers in foreign lands who often are also the victim of mindless subjugation.
This allows the bourgeois the best of both the worlds-to militarily repress the low paid via military-industrial complex,covert operations and Coup d'états and economically control the better paid by mindless control over unlimited useless consumption to banking on social discrimination based on various aspects like language, colour, creed, ethnicity, religious beliefs and gender.
More is the pity- because it is only the alliance of the workers from all lands that can put a stop to predatory capitalism, reaffirming the human needs and capacities that capital alienates and distorts.
reference:
Smith, David, and Phil Evans. Marx's Kapital for beginners. 1. 1. Newyork: Pantheon, 1982. 159-161. Print.