God and his Universe

What is the ultimate end state for people who act malicious, evil? How should believers approach these people?

What do you mean by “ultimate”? Is this to be understood in the sense Christianity and Islam use it or in Sikh sense? In Sikhi, wrongdoers will be punished for their bad deeds and rewarded for good deeds. Since they failed to attain union with God, they will be sent back to the cycle of life and birth again. This cycle will continue until they reach perfection. Heaven and hell are part of creation. Hence, they are temporary. Sikhs should help them in any way possible to become better human beings. They must treated equally like our humanly brothers.