@Il_bello_dei_panda well, killing doesn't gives justification because I have seen in the movie of Spiderman where Peter tries to kill green globin in there but other variants of Peter stops Peter. I don't remember what they say at that time but I know that they are consequences of killing person which we suffers and our surroundings also suffers like friends and family will have emotional and financials damage. Also, that's the reason today laws were created to stop people killing and in some countries for raping even without action of father that man gets dead. Well, if that man lives freely outside without getting dead penalty also not even going to jail in simply language he doesn't gets punished for his crime then That father killing that man doesn't need justification. Also, the thing people wants to be right is right for us because others put it that way or we were taught that way. In simple way killing a cockroach is good job why because people hate it and killing a butterfly is bad job why because people like it. But that people are collecting dead butterflies like a collection piece then people praise him. It is called peers pressure in another language you can search in Google or anywhere. Our mind simulation what's right and what's wrong by following other people.
Time is all thing and all the things are time
