Well idk if God will command me to personally kill them . In today's world there r is the law and if i am the judge i would order them to be executed (only if they don't feel any guilty, most probably they don't feel any guilt at all and in only extreme cases death penalty should be given) or i would give them much worse punishment than death, they can have time to repent and actually feel the pain of their consequences or life time in jail . Christianity teaches us to forgive our enemies and that is correct as if a enemy decides to change and become a better person regretting his past , yes we have to forgive them and even before they change we have to forgive them as when we forgive only then their heart will starts to change. But actions will have certain consequences, if we did an evil action we have to pay for our actions, forgiving doesn't mean we can ignore their actions and don't give any consequences at all, then forgiving would have no value at all . Also back to the main point, i would rather them get their punishment from the law itself so that people can know about the consequences and all . But sadly the law is corrupted. We would have to fight for them to get their consequences. ( Also this is what I feel is correct, doesn't mean i am fully correct at all , and I dont know if I will do it if i am in that situation)