To be fair, I guess it should be said that in Jesus' times, there was no such thing as a modern national state, and thus we don't know what he would have said about redistribution via taxes. There are Christians who argue with Jesus' teachings to justify limited public social programs, such as the Christian Democrats in Germany (the major center-right party here) and in other European countries.
As for war and violence, I believe we have to look at the historical context. At Jesus' times, things like blood vengeance and clan fights were not uncommon. Including unproportional retaliation (more than an eye for just one eye). So the OT law "eye for an eye" was a progress already, limiting the allowed retaliation in clan fights. Jesus went one step further, emphasizing the importance of forgiveness. But I believe he addresses especially individual "vigilantes" in his times.
The individual shall forgive. But that doesn't necessarily mean he believes there shall be no legal prosecution or no legal punishment by the legal system. At least that's how I understand it. Again, a similar problem as in the case above, when it's about the role of government in a modern nation state: It didn't really exist in Jesus' times, so we cannot be entirely sure.
