The Vedas and the Sacred Books say nothing in favour of death by killing, they imply life after death as for the man who creates peace, rejoices and opens the way to paradise through the Realisation of Vedic Knowledge. Now if the man who creates peace becomes unpeaceful, both he and others will suffer and this will be a very heavy loss for the society and this is what people will think and make statements like:
This evil will do not allow the Man who has created peace, now he is like a big bird, he cannot be killed, nobody will stop him even if he is huge. Therefore we can not kill him and yet can kill others, death by killing means death for others, it has nothing to do with happiness for the ones who have already chosen to live
This incorrect statement is nothing but ignorance.
I myself will kill the Evil one at the time he is becoming unpeace...