If Christians believe that Christ was a God and immortal (or resurrected), why do some avenge his killing in his name? Arguably the killing of Jesus Christ was the most avenged killing in history.  There is no other person for whom there were so many other people killed in the name of retaliation.

In Russian Empire the oppression of Jews was explicitly justified because of their complicity in Jesus' murder.

I wonder whether those Christians who thought that somebody, either modern or ancient, is guilty in killing Jesus, really believe in his resurrection and immortality?

How can one avenge a murder of an immortal? Or do those Christians believe in resurrection of Christ only metaphorically/figuratively? Do they think that he was resurrected in the body of the Church or in the spirits of Christians rather than physically?

An analogy: your father dead. You think that you or someone else is guilty. Then God miracliously resurrects your father. Do you still feel remorse, guilt or desire for revenge?

Is not desire for revenge actually a disbelief in real resurrection?
Nnowhere in scripture, or any Christian theology that I know of, are Christians commanded to avenge Christ's killing. In fact there is good evidence to say that God opposes it: "'Vengence is mine', sayeth the Lord". So any Christians who are taking revenge on any group because they believe them to be responsible for Jesus' death are not acting according to Christian principles. I'm not of course saying it hasn't happened - but since it's not in accordance with Christian principles then you aren't going to find any logical or theological justification.