Historical quotes that are also ignored:
- "A soldier of the civil authority must be taught not to kill men and to refuse to do so if he is commanded, and to refuse to take an oath. If he is unwilling to comply, he must be rejected for baptism. A military commander or civic magistrate must resign or be rejected. If a believer seeks to become a soldier, he must be rejected, for he has despised God." Hippolytus, Apostolic Tradition, 16
[*]"Those soldiers were filled with wonder and admiration at the grandeur of the man’s piety and generosity and were struck with amazement. They felt the force of this example of pity. As a result, many of them were added to the faith of our Lord Jesus Christ and threw off the belt of military service." Disputation of Archelaus and Manes
There is a method of those who ignore the scriptures and tradition to justify war and government involvement. They completely ignore the bulk of scriptures and target a single reference that they can alter the meaning of to suit their argument. This is true of "unequally yoked". Taken on its own the scripture can be applied to any argument you wish, or specifically to idolatry; but added to the scriptures already shown it is clearly used by the Apostles in the broader sense, and not just to idolatry. These arguments and debates then become circular, as they inevitably arrive back at the same points that were first misread, and the game continues. We need to be cautious not to fall for these methods used to undermine God's word. These methods were used by philosphers to debate against Christians, and they were taken up and taught in universities through methods of debate. Here again we need to be careful not to be "unequally yoked".
I think Origen addresses this point well.
Origen 185-254
Against Celcus Book 1 chapter 75
Chap. LXXV. Celsus also urges us to “take office in the government of the country, if that is required for the maintenance of the laws and the support of religion.”
But we recognise in each state the existence of another national organization founded by the Word of God, and we exhort those who are mighty in word and of blameless life to rule over Churches.
Those who are ambitious of ruling we reject; but we constrain those who, through excess of modesty, are not easily induced to take a public charge in the Church of God. And those who rule over us well are under the constraining influence of the great King, whom we believe to be the Son of God, God the Word. And if those who govern in the Church, and are called rulers of the divine nation—that is, the Church—rule well, they rule in accordance with the divine commands,
and never suffer themselves to be led astray by worldly policy. And it is not for the purpose of escaping public duties
that Christians decline public offices, but that they may reserve themselves for a diviner and more necessary service in the Church of God—for the salvation of men. And this service is at once necessary and right. They take charge of all—of those that are within, that they may day by day lead better lives, and of those that are without, that they may come to abound in holy words and in deeds of piety; and that, while thus worshipping God truly, and training up as many as they can in the same way, they may be filled with the word of God and the law of God, and thus be united with the Supreme God through His Son the Word, Wisdom, Truth, and Righteousness, who unites to God all who are resolved to conform their lives in all things to the law of God.