With the current crop of remorseless juvenile offenders in the U.S. (Juveniles being the most potentially violent among any age group) it is now a coin toss whether you should cooperate or not during a robbery.
This became especial troublesome after the Supreme Court ruled that juveniles cannot be executed for capital murder in the U.S. which essentially gives the kids an incentive to eliminate witnesses because even if they are caught the worst that will happen to them is jail time.
Even the famous 7-11, "anyone resisting a robbery will get fired” rule has been ruled unconstitutional in court when a worker who resisted and was fired, sued 7-11. The judge said that the inherent right of self protection trumps arbitrary rules imposed by employers.
After 9-11, the conventional wisdom of going along with your robber/hijacker has been called into doubt.
Another trend from 9-11, which I applaud, has been the increasing number of states passing "right to carry" laws, that in essence states that anyone is entitled to carry a conceal weapon unless the state's authorities can show that an applicant shouldn't get a license; i.e. prior conviction with a firearm, violent crimes, etc.
As statistical evidence mounts that those states that permit "conceal carry" don't have a higher incident of crime by licensed carriers you'll see other states pass similar laws.
In Texas, crimes against women has declined since the law was passes; a young lady blew away a convicted rapist after he grabbed her in a parking garage, raising interest in firearms among women and increasing the number of application from women.
An armed populace tends to be a more polite populace
“The American Republic will endure until the day Congress discovers that it can bribe the public with the public’s money.” Alexis De Tocqueville 1835