I truly commend you for even asking this question because it shows consideration for life even evil lives, and you consider God in your decision. I feel your pain, truly, yet I know that failing to hold them accountable would not only mean a painful death for me and my wife, but I think back on all the innocent lives they tortured and cut short. They have earned God's warnings and have disregarded them all and refuse to repent and change their ways. Remember, Elijah in his days slaughtered them all because he knew what I know. There are only two types of people on this earth, even the neutral are evil because they let the good die and evil to flourish. An remember, when Christ was transfigured into a partial Light body, he was seen speaking with Elijah and Moses. Moses freed the captives also and slaughtered their pursuers. They were warned with signs and wonders, but still pursue innocent blood for their drunkenness and wickedness is unquenchable.
Kings 1:18:40
Then Elijah ordered them, Seize the prophets of Baal! Do not let a single one escape. So they seized them, and Elijah brought them down to the Kishon Valley and slaughtered them there.