I dunno. I think it's mostly that people are lazy, and *many* people who are drawn to crime do so because their job skills aren't cutting it elsewhere. (If you've ever read about the incompetence of many Mafia hits, you know what I'm talking about here.)
But, really, it's a lot easier to hijack a plane than to, say, build a cyclotron.
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But, really, it's a lot easier to hijack a plane than to, say, build a cyclotron.