Your example of defensive jihad, it is a little difficult for me to grasp.
If someone was beaten halfdead, and that someone during the struggle caused the aggressors death, that would be one thing. But to come back later and murder that person, would that not be regarded as, premeditated murder.Or have I missunderstood the example?
My example was based on this verse, I admit if it was kinda bad since I was very busy when I wrote that verse.:
"Fight in the cause of Allah those who fight you, but do not do aggression, for Allah loves not the aggressors. Fight in the way of Allah against those who fight against you, but begin not hostilities. Lo! Allah loveth not aggressors. And slay them wherever ye find them, and drive them out of the places whence they drove you out, for persecution is worse than slaughter. And fight not with them at the Inviolable Place of Worship until they first attack you there, but if they attack you (there) then slay them. Such is the reward of disbelievers. But if they desist, then lo! Allah is Forgiving, Merciful. And fight them until persecution is no more, and religion is for Allah. But if they desist, then let there be no hostility except against wrongdoers." (Al-Baqarah 190-194)
It was revealed after the Meccans drove out Muhammed (Pbuh) from the city and his compasions. Laters on there was a war and it was a defensive one since they took their freedom, home. Again as you see ''But if they desist then lo! Allah is forgiving'' Means if the war could have ended in a peaceful way then accepet it since Allah is the forgiving one, merciful.
Muhammed(phuh) Was sometimes covered with dirt, stoned by the people of quraish because he called to Allah, and said there's only one God and Thats Allah. They even tried to kill him, and thats when it was the first migration.
(Btw if you're interested in the life of Muhammed(Pbuh's) life then you can find lots of information on the internet, ask me if you're stuck.
Verses like this can be found here aswell About justice, :
O you who believe! Stand out firmly for justice, as witnesses to Allâh, even though it be against yourselves, or your parents, or your kin, be he rich or poor, Allâh is a Better Protector to both (than you). So follow not the lusts (of your hearts), lest you may avoid justice, and if you distort your witness or refuse to give it, verily, Allâh is Ever Well Acquainted with what you do [4:135]
"Show forgiveness, enjoin what is good, and turn away from the foolish (i.e., don't punish them).'' (7:199)
"The good deed and the evil deed cannot be equal. Repel (the evil) with one which is better (i.e., Allah orders the faithful believers to be patient at the time of anger, and to excuse those who treat them badly) then verily he, between whom and you there was enmity, (will become) as though he was a close friend. But none is granted it (the above quality) except those who are patient - and none is granted it except the owner of the great portion (of happiness in the Hereafter, i.e., Jannah and of a high moral character) in this world.'' (41:34,35)
The way (of blame) is only against those who oppress men and wrongly rebel in the earth, for such there will be a painful torment. (42:42)
"And verily, whosoever shows patience and forgives that would truly be from the things recommended by Allah.'' (42:43)
And by the Mercy of Allah, you dealt with them gently. And had you been severe and harsh-hearted, they would have broken away from about you; so pass over (their faults), and ask (Allah's) Forgiveness for them; and consult them in the affair. Then when you have taken a decision, put your trust in Allah, certainly, Allah loves those who put their trust (in Him). [3:159]