Um... what?
I crunched some numbers. Approximately 1/3 of homicides were triggered by arguments. About 1/5 were felonies (involving rape, theft, narcotics, essentially the kind of crime you're trying to describe). Gang-related violence accounted for about 1/20th and the remainder are unknown or unsolved (which really doesn't help to validate the legal system as a source of deterrant, does it?)
Less than 1% of all homicide cases involve multiple offenders killing multiple victims, which indicates that the Sicilian mafia shootout in an Italian restaurant isn't a major problem.
Data from:
http://www.ojp.usdoj.gov/bjs/homicide/overview.htm
The data on that site shows that most murders are a 'heat of the moment'-type deal, except in the case of the felony murders which often result from botched attempts at other crimes that do not carry the death penalty (armed robbery, burglary). Hell, the DOJ website even says that people from the southern states are
4 times more likely to react violently to an argument or an insult! That doesn't sound like a group of people who are afraid of the death penalty!
Snarkiness aside, the following US states both still have the death penalty and have executed more than 30 people since 1976: Texas (366), Virginia (95), Oklahoma (81), Missouri (66), Florida (60), North Carolina (42), Georgia (39), South Carolina (35), Alabama (34).
Murder rates:
Texas: 6.2
Virginia: 6.1
Oklahoma: 5.3
Missouri: 6.9
Florida: 5.0
North Carolina: 6.7
Georgia: 6.2
South Carolina: 7.4
Alabama: 8.2
This is with an average national homicide rate of 5.6.
Data from:
http://www.disastercenter.com/crime/
Some states with the death penalty have a homicide rate lower than the national average. Some of the states have a homicide rate higher than the national average. So what do these numbers prove? Absolutely nothing! There is no demonstratable correlation between having the death penalty and either increasing or reducing the incidence rate of homicides. These numbers illustrate how execution does not deter murderers any more than incarceration.
Furthermore, Canada (a first-world country in North America with no death penalty and a society principally influenced by American media) has a murder rate of 2.04 per 100,000 compared to the Americans' (a first-world country in North America with death penalty and a society principally influenced by American media) of 5.6.
I shouldn't have had to type this all out. Jesus. The information is out there and you'd know this already if you spent even 5 minutes looking into it.
I beg your pardon, sir, but I don't believe you've actually been reading my posts. This is not a debate, I am not trying to make points. This is not my opinion.