You'll find that a lot of guys who have gone willingly into harm's way have had close calls and have experience watching friends who didn't make it through close calls. They've watched people bleed out. They've watched people get confined to a wheelchair for the rest of their life. They've probably seen somebody try and recover from severe brain trauma. They've seen the bills. They've seen the years of rehabilitation IF someone manages to survive. They've seen the toll all this takes on families, relationships, and finances.
Eventually they come to the conclusion that in the big unpredictable world we live in, when you pick a fight you've pulled the handle on the Karmic Slot Machine of Suck, and that what specific flavor you're going to get served is now almost completely out of your hands. So you'd better ask yourself whether or not the reason you're pulling that handle is really worth it. "Worth it" tends to look very different when the dude you just punched is laying in front of you with agonal respiration because one good punch knocked him out and his head bounced off the concrete. Now suddenly that spat over Gatorade has elevated into a potentially lethal use of force and all the criminal and civil liability that comes along with it.
...or, he could knock the snot out of you, and you could be the one laying there with agonal respiration and a likely brain injury. Only the other guy probably isn't going to try to render first aid. Or call 911. And should you survive, what do you think the odds are that he has sufficient assets to cover the medical costs you're going to incur recovering?
The guys who have willingly gone into harm's way have all figured out just how bad it can actually get...which is why you'll find that they frequently don't rush head-long into stupid ***CENSORED***. They avoid doing so for the same reason that King Leonidas didn't just fling his small band of warriors at the Persians in just any ol' spot.
There are times in life when you get handed a fight you didn't want and you have to deal with it. There are times in life when you need to stand up and take the fight to someone. There are also times when risking a fight is just ***CENSORED*** stupid. Being ***CENSORED*** stupid is rarely a good long term strategy for success in any endeavor, especially ones that involve violence.
The guys who have willingly gone into harm's way have figured all that out in the school of hard knocks. The wise man looks at the experience of others and learns from it. The fool insists that personal experience be his only teacher.