Just as sun, moon and rain are the signs that there is a supreme power(God) above us who is controlling everything. What signs do we have for Imam Mahdi(pbuh) that his presence is making calamities stay away from us especially in this time where we can see that those who love him and have expectations from him for his help are suffering and are helpless and those who walk away from him are in better place?
What are the signs of Imam Mahdi's love for us that he also feels something when we are sad and alone and are suffering by the hands of the people of this world?

Imam Mahdi’s presence is like the presence of the angels. They operate through the power and permission of Allah. The presence of Imam Mahdi is a major sign of the existence of Allah.