The fighting and chaos is created among humans by the satanic forces which inspire them to kill and suppress innocent people for their worldly domination. The success for all individuals lies in being righteous among all this anarchy and chaos and make constant efforts in fulfulling their divinely assigned objectives of life which is to establish the kingdom of heaven on this earth as the representative of God and be kind, generous, courteous, merciful and loving to all His creation so that we they be saved later in their REAL eternal life of the hereafter. Quran states:
By time, Indeed, mankind is in loss, Except for those who have believed and done righteous deeds and advised each other to truth and advised each other to patience. (Quran 103:1-3)
The paradise is simply the reward of individuals for being successful in this effort and hell fire is the punishment for not recognizing the divinely revealed truth due to their arrogance.
May Allah(SWT) guide us all and save us from the torments of hell fire. Ameen!