I first heard about the chastisement from a Garabandal site, however, as others have said, it is disapproved by the bishops and thus is suspect. I’m not sure if it originated from Garabandal, but if it did, any other alledged apparition site that mentions the said chastisement should also be suspect.
Having said that, I don’t think there’s anything wrong with wanting justice, but we have to let it be God’s will, not our will. Wanting a particular thing to befall on those who are doing wrong is like saying, “I hope you rot!” (maybe not that dramatic, but you get the point). We shouldn’t wish ill on others - besides, if the chastisement were to occur, there would be many sacrifices we (assuming we survive it) would have to make, and challenges to overcome. For example, we’d be an agrarian society again (at least for a few decades), there could be famine and disease for the first few years in more populated areas (perhaps in small towns, too if modern farming methods won’t be reliable) until things get settled again, and so on. So, it’s a double edged sword.