You cannot justify that. That you think you can is another sign of problems. Any response to damage that leads you, deliberately, to do more damage is the wrong response.
Respond to damage done by repairing it, by helping it. By lessening pain. By doing what we can to, we hope, make sure that damage doesn't happen in the first place.
This is not just inspired by the terrible news overnight of the mass shooting in a movie theater in Aurora, Colorado. It's also inspired by death threats -- death threats -- I've heard towards multiple people, for multiple reasons. (At least some of these are being investigated, by authorities trained to deal with this.) It's also inspired by fights I've seen, that I've heard of...
...because we have such a long history of too many of us doing bad things to others.
Oh, man. No insights. No firm grasp of any of this besides sadness and anger. And the wish that it were possible to hug as much of the world as I can.
Mostly, I'm tired of people being ugly to each other. I'm tired of all the pain I feel and hear in the world every day. There's too much of it. It's like pieces of glass in my head all the time. Can you understand? -- John Coffey speaking for Stephen King, The Green Mile (1996)
Edit: I'll add that normally tomorrow I'd be ready to donate blood, but won't tomorrow due to work. But I'll donate blood sometime next week. It's my habit, and one way I can help. Please, I ask sincerely, consider doing so as well. Peace.