Rich people are attracted to defense industries because it is something that will never decrease in demand. No country can ever be secure completely. You may have superiority on the battlefield, but you may not have superiority in cyberwar. You may have superiority in conventional strength, but not unconventional strength. The ancient Greeks were able to reliably defeat the Achaemenid Persians on the battlefield, but because the Persians were superior in every other capacity, Greece eventually became a tributary region of the Persian Empire. The United States was superior to the Viet Cong and North Vietnamese in funds and conventional strength, but its enemy had the upper hand in unconventional strength and in its ability to use time to its advantage.
Security will never be something that is not intensely desired. Weaker states submit to larger ones in exchange for security. This has been the way of the world since time immemorial.
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