It’s a human life so I imagine God is against it. It’s actually one of the Ten Commandments, which means He has already ruled on it.
Exodus 21:
12 “Whoever hits and kills someone must be killed too. 13 But if an accident happens, and a person kills someone without planning it, then God allowed that thing to happen. I will choose some special places where people can run to for safety. So that person can run to one of those places. 14 But whoever plans to kill someone out of anger or hatred must be punished. Take them away from my altar[c] and kill them.
From Matthew, Chapter 5. I think Jesus calls on us to pray about it:
Jesus Teaches About Fighting Back
38 “You have heard that it was said, ‘An eye for an eye, and a tooth for a tooth.’[i] 39 But I tell you, don’t fight back against someone who wants to do harm to you. If they hit you on the right cheek, let them hit the other cheek too. 40 If anyone wants to sue you in court and take your shirt, let them have your coat too. 41 If a soldier forces you to walk with him one mile,[j] go with him two. 42 Give to anyone who asks you for something. Don’t refuse to give to anyone who wants to borrow from you.
Love Your Enemies
43 “You have heard that it was said, ‘Love your neighbor and hate your enemy.’ 44 But I tell you, love your enemies. Pray for those who treat you badly. 45 If you do this, you will be children who are truly like your Father in heaven. He lets the sun rise for all people, whether they are good or bad. He sends rain to those who do right and to those who do wrong. 46 If you love only those who love you, why should you get a reward for that? Even the tax collectors do that. 47 And if you are nice only to your friends, you are no better than anyone else. Even the people who don’t know God are nice to their friends. 48 What I am saying is that you must be perfect, just as your Father in heaven is perfect.