Divine decree and wisdom

لِيَقْطَعَ طَرَفًا مِّنَ ٱلَّذِينَ كَفَرُوٓا۟ أَوْ يَكْبِتَهُمْ فَيَنقَلِبُوا۟ خَآئِبِينَ

That He might cut down a section of the disbelievers or suppress them so that they turn back disappointed.

كَمَآ أَخْرَجَكَ رَبُّكَ مِنۢ بَيْتِكَ بِٱلْحَقِّ وَإِنَّ فَرِيقًا مِّنَ ٱلْمُؤْمِنِينَ لَكَـٰرِهُونَ

[It is] just as when your Lord brought you out of your home [for the battle of Badr] in truth, while indeed, a party among the believers were unwilling,