[Pooya/Ali Commentary 4:52] "Allah has cursed" indicates that cursing those who have gone astray (and by throwing the commandments of Allah and the teachings of the Holy Prophet to the winds inflicted pain and misery on the Ahl ul Bayt) is a godly act. "And whosoever Allah curses, for him you shall not find a helper" means that neither their ostentatious good deeds, nor the invocations of blessings by their friends and followers on their behalf will save them from the eternal punishment.