Answer: 
"You are right - it is all about fighting man to man as opposed to high-tech war-situations, where you don't have to see the enemy (Isn't that what Dr Cazlet of Orbit was all about?) Its easy to fight an enemy you can't see - where all you have to do is press a button. You dont have to see mutilated bodies, travesties of what was once human. Its so much more difficult when you're faced with a human who's flesh and blood, just like you. That's when you get down to thinking, why am I doing this? ...one thing common to all the fight sequences is that the boys are never the ones to iniate a fight. Everything is always in response to a threat.

Why Sam fights - I think think the answer boils down to survival (kill or be killed), to neutralizing a life-threatening situation (kill or watch thousands of innocent people die). " expert-witness Susan Morden, protocolled 23. März 2000

Evidence: 
All Fighting sequences from "Back to Business" (27.03.99) to "Glory Days" (17.07.99)

"Sam is a handy man to have on your side whether its fisticuffs (Orbit), or a gun battle (almost all eps but especially Skorpion, First Strike, High Speed, Glory Days). He doesn't pull his punches nor does he hesitate to pull the trigger. He uses his fists well and he's a crack shot. You can tell he was a boxer because when it comes to a free for all, he appears to rely on his fists (Phoenix, Tusk Force, Orbit) (I am a karate exponent myself and I prefer kicks - but in unarmed combat, I use a combination of punches and kicks)." Susan Morden, 23.03.2000

Comment:
The guys use their guns more often than their fists but I think its more out of necessity. Its stupidity to try unarmed combat when you are faced with an Uzi or a Kalashnikov or a gun of any sort, especially when the weapon is in the hands of a person who wouldn't think twice before killing you. I think as we invent more and more sophisticated weapons, the more difficult it will be for law enforcers to avoid shootouts, the more difficult it will be to bring in someone alive for questioning. For someone who thinks first, Sam shows no hesitation in pitching into battle if a friend is in trouble. Like I said, its very comforting to have Sam on your side in a fight.

susan morden 15. April 2000