I admit that I cannot comprehend why anyone would think that deliberately ending someone's life is laudable. Yes, things happen by accident. People drive around in lethal weapons all the time. People get angry or frightened and lash out. But writing a story is not something that's over in a flash and can never be taken back. It's an act of deliberate creation and as such, calls on us to be mindful. Listen, folks. Life is all too brief, and incredibly precious. It's totally not okay with me to deliberately cut short a human life. For greed, for bigotry, for revenge, for patriotism. In fiction we often do kill off characters. If you do it, do it with full awareness of the cost.
Don't say it's only entertainment. That is such a bullshit excuse for not paying attention to human suffering. Go shoot up tin cans or climb a mountain instead of filling your stories with shooting galleries. Scream at clouds. Get some professional help - but don't pretend that blowing up characters left and right has no consequences. It's even worse if your "hero" is laughing and spouting nonsense like "That'll teach them" or "They had it coming."