Behaviour of Terrorists are judged in Islam on the basis of words of Prophet Mohammed (peace be upon him). Here are few hadiths regarding kindness to all creatures. Islam do allow to shed blood of innocent people (like the events of 9/11 or 26/11).
Any one who do not obey Allah (SWT) and His Prophet, is not a Muslim. Your words, "Allah must be sad by looking at these demonic acts on his name" is befiting the behaviour of the terrorists. Prophet Mohammad - “Kindness is a mark of faith and whoever hath not kindness hath not faith.
Prophet Muhammad - “He who is not kind to God's creatures, and to his own children, God will not be kind to him. Prophet Muhammad - “Whoever is kind to His creatures, God is kind to him therefore be kind to man on earth, whether good or bad and being kind to the bad, is to withold him from badness, thus in heaven you will be treated kindly. Prophet Muhammad - “All God's creatures are His family and he is the most beloved of God who doeth most good to God's creatures.
Prophet Muhammad - “Who is the most favored of God He from whom the greatest good cometh to His creatures. Prophet Muhammad - “He who helpeth his fellow-creature in the hour of need, and he who helpeth the oppressed, him will God help in the Day of Travail. Prophet Muhammad - “To gladden the heart of the weary, to remove the suffering of the afflicted, hath its own reward.
In the day of trouble, the memory of the action cometh like a rush of the torrent, and taketh our burden away. Prophet Muhammad - “God is not merciful to him who is not kind to mankind.
In Islam a killer that is a Muslim has to be killed right away so that Allah could forgive his sins after he begs Allah for forgiveness. But since there are governments, they are responsible for everything that happens in a country. That was a long time ago that they used to kill killers.
A long time ago when France attacked Syria, Syria had small towns and allies back then and there was no government so they killed the killers.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.