Several factors contribute, I'll list a few that I think are important, though certainly not an inclusive list:
1. Hubris
2. A flawed, (generally too expansive) assessment of what one's vital national interests are.
3. A flawed assessment of the nature and extent of the "threat" one is seeking "to defeat overseas so that it does not wash up on our shores."
4. A combination of genuine desire to help a populace or government in distress and jumping into a scuffle that one does not understand; winding up either helping the wrong party or simply getting roughed up by one or both for one's efforts.
5. Being talked into doing something one knows is foolish and risky by one's advisors (this only sounds like I am talking about VP Cheney), or by powerful corporate or national lobbies (this only sounds like I am talking about oil companies, or Israeli/Saudi lobbies) or the media (liberals and conservatives equally at fault here Fox and MSNBC...).
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