Because several prominent world religions require it. Suggesting that a barbaric ancient practice no longer be done could be construed by some hateful.
You are not speaking against DV. You are making excuses for an attempted murder psychopath by making bullshit up in your head for why the male victim deserved it.
A person who is capable of committing such atrocities does not have the mind of a 6yo. They have the mind of a psychopath. They are not worth attempting to rehabilitate or waste tax money on by allowing them to rot in jail for life. It's not fair to place them as a burden on society after what they have done. A quick and painless execution is the most just option for all involved.
A special circle of hell is reserved for child murderers. Ironic how she thought killing them would prevent their innate evil as men from harming women, but only succeeded in revealing the depths of depravity and evil within herself.