How a Christian must respond to adversaries

It has become readily apparent that a significant number of Christians have decided that those who oppose them, in a variety of settings that include church controversies, business, and politics, ought to be treated as an "other" and defeated by nearly any means necessary.  For too many of us, the ends justify the means because we have pridefully defined our chosen end as God's will.  And while history has shown how dangerous this attitude can be even when a nation is facing an existential threat {see for example: the firebombing of Dresden, and the internment of Americans of Japanese descent during WWII}, it can in no way be argued, according to the Scriptures {which is what ought to matter to a Christian}, that this is the morally appropriate choice for an individual, or group, of Christians. 

Romans 3:8 New International Version (NIV)
8 Why not say—as some slanderously claim that we say—“Let us do evil that good may result”? Their condemnation is just!

Romans 12:21 New International Version (NIV)
21 Do not be overcome by evil, but overcome evil with good.

Matthew 5:43-48 New International Version (NIV)
43 “You have heard that it was said, ‘Love your neighbor and hate your enemy.’ 44 But I tell you, love your enemies and pray for those who persecute you, 45 that you may be children of your Father in heaven. He causes his sun to rise on the evil and the good, and sends rain on the righteous and the unrighteous. 46 If you love those who love you, what reward will you get? Are not even the tax collectors doing that? 47 And if you greet only your own people, what are you doing more than others? Do not even pagans do that? 48 Be perfect, therefore, as your heavenly Father is perfect.

We, as Christians, have been called to a higher standard.  We have been charged with living as disciples of Jesus Christ and thus imitating our Savior in this world.  To "win" a battle utilizing immoral means is to lose the war. 

Hear this, and hear it well: God is the judge of the world.  It is better for us to lose morally than to try to win immorally.  We have not been given a command to be winners, we have been given a command to be righteous.  In this world, they're not typically the same thing.  Each time Christians choose to try to be winners rather than righteous, they demonstrate that they don't have sufficient faith in God's final victory and they taint the message of the Gospel {as hypocrites}.

Zechariah 4:6 New International Version (NIV)
6 So he said to me, “This is the word of the Lord to Zerubbabel: ‘Not by might nor by power, but by my Spirit,’ says the Lord Almighty.