Why do good people in the world, Muslims and non-Muslims, suffer and die, while evil people do not receive their just deserts?

All people, whether good or not good, are afflicted with tribulation. The tribulation that afflicts the good benefits them in the Hereafter. For the believer, his sins are expiated by tribulation in this world, and he is rewarded for his good deeds in the Hereafter. As for the oppressed disbeliever, his oppression alleviates his torment on the Day of Resurrection, even if he never leaves the Fire. This world is a realm of tribulation and trial, not a realm of absolute justice. Absolute justice will be established in the Hereafter. Believers are tested so that Allah may know those who believe and take martyrs from among them, and that Allah may purify those who believe and destroy the disbelievers.