The factors that give this prophecy credibility are that the visionaries themselves lived unusually holy lives. Many of their other prophesies have come true, so, it is a strong probablility this one will be accurate.
Did you notice the prophecies that predict that there will be a supernatural event known as the “warning”, wherein, everyone will experience the knowledge of where their soul stands
in the eyes of God? Apparently, people will be shocked even unto death. It is supposed to be much like our judgment day, except it will not be too late, at that point, to repent, as it would on our actual judgment day. This is considered a great grace. A last ditch effort, so to speak, to repent.
There are some who believe in a type of rapture in which some innocent children will be “taken up” before the three days of darkness, so as to spare them the horrors of the day. Following the three days of horror, the Church will have been “purified” and there will be peace.
For those who are more knowdegable than I, at the end of the world will the Kingdom of God on earth have come and things are good? Or, will He come in the nick of time, when things are at their worst?