This is the new-age version of Jesus, not the Jesus found in the Bible.
Jesus did preach peace and loving your neighbor, but he did not say never be a solidier, or that all wars were unjust.
There are numerous instances of soldiers in the New Testament, never is there any condemnation of the fact that they were soldiers.
Check the last part of Revelation. Not only does Jesus come back and lead an army, he does all of the fighting.
As individuals we are not to get justice on our own. Governements were created to do that. Sometimes that includes war.
Did we in our own strength confide,
Our striving would be losing;
Were not the right Man on our side,
The Man of God’s own choosing:
Dost ask who that may be?
Christ Jesus, it is He,
Lord Sabaoth, His name,
From age to age the same,
And He must win the battle.
And though this world, with devils filled,
Should threaten to undo us,
We will not fear, for God hath willed
His truth to triumph through us: