The real world doesn't, but we're talking about a game here. It's called fairness to the other players plain and simple.
What game are you playing? Rainbows and Lollipops?
I don't know about you guys, but I like having friends even after a roleplay session... Not having four torn-up character sheets because my players are idiots and I have every right to be mean to them because I'm the gamemaster.
And besides, Shadowrunning doesn't seem that gritty. Some parts of the rulebook are dark, some seem to be funny or comedic. It's a mixed bag, so arguing about it might be pointless...
Ok. Some axioms of the Sixth World then:
Mr. Johnson never lies.
Even if Johnson tells runners, that: "Opposition is second to none, and I expect no further complications." he doesnt lie.
Street gangers are always amazed by runners professionalism, so they always agree to negotiate.
Even if they don`t, they surrender to basic violence display.
Contacts are telling you the truth without side interrests.
Running means hurting "those bad", so runners are usually "Those good", even helping humanity on its way to the bright future.
Ghouls feel sorry for eating humans. They usualy cry when eating babies.
Dragons and AAA`s are not ruling the world for their own, unrecognizable interests, but for the greater good of every living "sapient" being.
Deus is not a threat.
Insect spirits are setting people free from pain and sorrow, bringing final calm and unity for everyone willing to listen long enought.
Media are like Mr. Johnson: They don`t lie.
Living in Aztlan is good for your soul and heart.
Desert wars are just trid show, those people dont die really...its the same as Urban Brawl.
Humanity being whipped by a few Vitas pandemics, UGE, racial and "shapial" hattred, Comunication and financial infrastructure crashes is great fiction (actually, it is

)
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When you read Street Legends, you feel like you are reading about some bunch of clawns and jokers, witch I can see is funny and comedic (acually, it is sad, at least in a few cases)
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Nobody gets hurt.
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Players and friends are pissed off, because they run out of luck in postapocalyptic game and their characters got hurt.
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Sichr is not Uncouth, just acts like he is (actually, he is really nice guy IRL

)