Right, so if I determine someone is lost and is totally evil, I can justify killing them? After all, I am helping God sort things out. This is why we have so many religious wars!
There are things written in the Bible that should never have been put there. Human minds are not able to discern the truth from those writings and it was a mistake to include them.
The Bible is clear we shall not kill, that right to judge a life is reserved solely for the Creator. Religious wars are products of other faiths, one who kills in the name of God does not follow the teachings of the Bible.