"For the protection of the righteous,
For the destruction of the wicked,
And for the establishment of Dharma,
I manifest Myself in every age."
Lord Krishna declares in Gita (4.8)
This statement need not be restricted to Hinduism. In the early part of the twentieth century, in Portugal, the monarchy was overthrown & a de facto Police State was established which was anti-religious & prohibited priests & nuns from wearing their customary habiliments. They were also embroiled in the first world war.
In this predicament, a divine apparition, identifying herself as "The Lady of the Rosary" appeared to three shepherd children & talked to them. Even the local pastor did not believe them & the administration persecuted them. Only after a public miracle, were the authorities convinced & allowed the churches to open & continue their religious activities. However, two of the children died young as predicted by the apparition named Fatima, (a pseudonym of the Virgin Mary), ostensibly because of the then raging influenza epidemic.
To buttress the words of the Gita, the basilica of St.Fatima, which has become a bustling pilgrimage centre, is called the "The Shrine of the World." (St.Fatima having come down to alleviate the anarchy & authoritarianism then prevalent.)