Where was God's mercy when Christ cried in pain, Mohamed fled the country and Arjuna perished on the way?

Christ's suffering is so from our point of view only. He was above pain and pleasure.Being an embodiment of love and compion, He bore the pain for our sake and worked for our salvation. Mohammed fled the country so that he as a prophet could spread the messages of Allah -peace and happiness.Because of Allah's blessings only the prophet could establish Islam and spread the message of peace.Arjuna was reminded of his duty as a kshatriya .A kshatriya who fails in his duty will not attain self-realisation.This is what Krishna reminded him telling him that behind all the ever-changing life in this world ,there is an underlying truth-everything is impermanent in this world and by doing one's duty one can attain Moksha.