They still contributed to it.
Therefore if someone attacks your family and you fight back, you're just as guilty, because you're 'contributing to it'.
By your logic a person who attempts to murder someone, and that person - the victim who fights back, are equally guilty.
This is an issue that I have been thinking about recently. Of course you are not wrong, but there are other views of this problem.
School children are told when they defend themselves that they are guilty too because they should not finish what someone else started.
And that two wrongs do not make a right. But they see that the grown ups are hypocrites about these issues when they see people Killing and fighting on the news every day.
Governments are guilty of the same thing for other lesser events than you mentioned, that have started wars , such as vietnam, Iraq more recently.
Feuds between family or friends go on for generations because each time vengeance is sought for the wronged party.
Since we are here for our faith as Orthodox, we must also use scripture to guide these issues.
39 But I tell you, do not resist an evil person. If anyone slaps you on the right cheek, turn to them the other cheek also.
Love for Enemies
27“But to you who are listening I say: Love your enemies, do good to those who hate you, 28bless those who curse you, pray for those who mistreat you. 29If someone slaps you on one cheek, turn to them the other also. If someone takes your coat, do not withhold your shirt from them. 30Give to everyone who asks you, and if anyone takes what belongs to you, do not demand it back. 31Do to others as you would have them do to you.
32“If you love those who love you, what credit is that to you? Even sinners love those who love them. 33And if you do good to those who are good to you, what credit is that to you? Even sinners do that. 34And if you lend to those from whom you expect repayment, what credit is that to you? Even sinners lend to sinners, expecting to be repaid in full. 35But love your enemies, do good to them, and lend to them without expecting to get anything back. Then your reward will be great, and you will be children of the Most High, because he is kind to the ungrateful and wicked. 36Be merciful, just as your Father is merciful.
Of course these things are impossible for mankind most of the time, but we are supposed to try as hard as we can. And when we fail, to acknowledge our sins and repent.
However most men I know want to say how we are right and they were wrong. Not wanting to admit your mistakes means you are doomed to repeat them and worse than that, you are not forgiven.