I fully believe that murders and paedophiles deserve to die, maybe with severe physical torture beforehand aka Saw style minus the chance to escape.
However I do not believe that it should be enforced by law or allowed in any constituency, because there are too many misrulings and mistakes made by the courts on these issues, people can be framed, there is no 100% conclusive way to determine with 100% accuracy that a person was guilty or not guilty, and under capital punishment innocent people can be too easily sentenced as guilty, and they would likely be executed before their innocence or misjudgement could be proved.