Rape is always about control. A man that rapes for the sake of being filled with lustful desires lacks the ability to control himself. A man that rapes in a war situation is exerting control of an innocent.
I don't understand your statement about kuffar no longer having fear over muslims. Are you suggesting that they should? I can understand a mutual respect. I can't understand one religious group fearing the other.
Muslims have little or no power in the world, it used to be the case that a Muslim woman was exposed, not even attacked and the whole muslim world would march to war against the people who wronged her.
This happened when Yazid, a tyrant amongst the early muslims heard of one muslim women being exposed by the romans. he sent a letter saying that this letter is at the head of the army, the back of the colemn only now leaves medina.
long after that no roman would think of looknig at a muslim woman, the kuffar (disbelivers) should fear those who bring justice only if they are injust but islam has come to end oppression whether that be amongst the muslims or non-muslims.