According to roughly a dozen recent studies, executions save lives. For each inmate put to death, the studies say, 3 to 18 murders are prevented.It is amazing how many otherwise intelligent people say that they are against the death penalty because it has been proved not to be a deterrent. In fact, nearly all the research for decades has shown that the death penalty is a deterrent.
The effect is most pronounced, according to some studies, in Texas and other states that execute condemned inmates relatively often and relatively quickly. ...
To economists, it is obvious that if the cost of an activity rises, the amount of the activity will drop. ... To many economists, then, it follows inexorably that there will be fewer murders as the likelihood of execution rises.
There are other arguments against the death penalty, but people should realize that saving the life of a convicted murderer could result in some other innocent person getting murdered.