I have homicidal thoughts and urges
Why do you have homicidal thoughts?
I can't help but to think about murdering people
This sounds serious. If you want help seeking professional assistance, let me know ASAP.
I can handle it. I know how to deal with murder now and I don't want those people to suffer.
I know you think you can handle it, but I really think you should seek some professional help. Having homicidal urges is pretty scary and I think getting some therapy would help you feel better.