 Complete the following phrase:  In retentionist countries, the debate is sometimes revived when a miscarriage of justice has occurred though this tends to cause legislative efforts to improve the judicial process rather than to abolish the death penalty. In abolitionist countries, the debate is sometimes revived by particularly brutal murders though few countries have brought it back after abolishing it. However, a spike in serious, violent crimes, such as murders or terrorist attacks, has prompted some countries to effectively end the moratorium on the death penalty. One notable example is Pakistan which in December 2014 lifted a six-year moratorium on executions after the 