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Gates is a businessman. The answer is obvious, although I forget the source at the moment - "one dollar more". Although, in Gates case, it's not to have, but to give away.
China isn't really concerned about anyone attacking them, certainly not to the point where they're going to forego projects that (physically & economically) benefit the population out of concern about creating a vulnerability. Just like it is here in the USA, concerns about a "big war" primarily exist as pretext to justify buying munitions.