Cooperation. Most criminals don't want to kill anyone - so doing as they say will often save your life. And did YOU know that if your working in a quick shop and you are robbed - it is illegal to try and fight the criminals? I suggest just doing as they say and letting the police catch them. Most criminals are caught. If you want to carry a gun and fight the bad guys, join the police.
P.S. When was the last time you encountered a gun toting criminal when you took "a walk on the street"?
If you mean when was the last time I saw an armed criminal? About a year ago when I was in Chicago. And one encounter with one is one too many.