Sorry but there's no way I could personally condone hurting others. Unless in extreme circumstances- self defence or, I could understand a knee jerk reaction to witnessing someone doing something awful I guess.
Please bear in mind though that, whoever you target could well be quite innocent. How would it feel if some random stranger just randomly attacked one of your family members because they felt compelled to do so? Voices told them to do so or whatever?
If I'm really honest, your posts do frighten me because I wonder just what you are considering. Plus, selfishly, I'm in the UK- as I believe you are. Honestly, it frightens me that some individuals out there are plotting to do harm to people I might know and care about. Unlikely of course but, you never know. Whoever you target and however badly you 'hurt' them, you could have a very profound affect on their lives and the lives of the people who care about them. Honestly, it doesn't seem justified to me- just so you'll find it easier to CTB.
Sorry to sound so harsh. I do have sympathy for how you must be feeling to contemplate this but truthfully, I'm begging you to reconsider involving other people.