Why is Allah allowing this to happen to them? | The blessing of Al-Islām is greater than any other blessing

Imām Al-Barbahārī raḥimahullāh stated [Sharḥ As-Sunnah]: واعلم أن الله فضل العباد بعضهم على بعض في الدنيا ولآخرة، عدلا منه، لا يقول: جار ولا حابى، فمن قال: إن فضل الله على المؤمن والكافر سواء فهوا صاحب بدعة، بل فضل الله المؤمن على الكافر. والطائع على العاصي، والمعصوم على المدخول، عدلا منه هو فضله يعطيه من يشاء ويمنعه من يشاء. “Know that Allāh has favoured some of His servants above others in this world and the Hereafter out of justice. It should neither be said that He is unjust or partial. Whoever says that Allāh has blessed the believer and disbeliever equally is an innovator. Rather, Allāh has favoured the believer above the disbeliever, the obedient above the disobedient, and the innocent above the guilty out of justice. He gives His blessings to whomsoever He wills and withholds from whomsoever He wills.”