Muslims are protected by God from all sorts of devious plots. They are protected at all times.
A Muslim would be aware of evil plottings but would not be distressed about them; that is because God is the One Who creates them as well, so a Muslim should keep his calm.
Games will be played all over the world in the End Times, Mahdi (pbuh) is the one who will give those games away.
Since the Prophet Joseph (pbuh) has been subjected to deceits, it is apparent that Hazrat Mahdi (pbuh) will be subjected to them as well. Actually Surat Yusuf consists of verses that symbolically explain the attacks that Mahdi (pbuh) will be subjected to.
Their schemes are necessary for the system of the Mahdi. Those schemes are the nutrients of the Mahdi (pbuh). Mahdi advances upon those schemes anyway. He rises by stepping over the dajjal (antichrist). The system of the Mahdi rises up by stepping over the Pharaoh. They are like a ladder, the system of the Mahdi rises even more each time they come upon him.
The evil schemes plotted against him nurture Hazrat Mahdi (pbuh).