Jesus' action at the temple has nothing to do with what we are discussing. However, Jesus said, "all authority on heaven and earth has been given to me" - on that basis -- the basis that He is God in human flesh -- He has the authority to judge people. That being said, he did not kill them did He (even though He was justified in doing so since the money changers were ripping people off in the name of God!!). His anger was a RIGHTEOUS anger. Whoever told you this is an example of violence has a horrendous understanding of the New Testament.
Now that your single objection has been dispensed with, please tell me -- where in the New Testament (the single authority for Christ's teachings) does it teach us to murder and kill in the name of God. If you can't produce it, then perhaps you should change your opinion to correspond with the truth? If you refuse to do that, then I must assume you are operating on uninformed bias.
I never said such a justification existed. I said people have murdered and killed in the name of Christianity. And as a matter of fact, they have done so for more centuries than not. If you're being murdered, it doesn't help if your killer has his theology wrong. Religions are embodied in people, institutions like churches, and governments. If the people running things are evil, the words mean nothing.