What do you think capital punishment is, then? It is the cold-blooded, pre-meditated, calculated and methodical killing of a person. This is precisely the definition of many murders, perhaps most. The fruit, therefore, is no different.

If we have faith and trust in God's actual word, he will deal with our enemies. But what do we do? We turn to self-reliance, thereby tying God's hands and demonstrating our lack of faith and trust in the process. 

I am sorry to say this, but almost every line you've typed shows that you do not really believe in God, only in yourself. If you believed in him, truly believed, then you would obey HIS commandments rather than those of the Roman Catholic Magisterium which clearly contradict the clear teaching of Christ and are leading God-knows-how many away from the narrow path.