This world has many problems, and many people suffer on this planet for different reasons.
If all people are eventually saved what is the purpose of people being on earth with all the problems, and suffering.
God could of created all people to be with Him and cut out the earth, and the result would be the same, for it would not matter if you chose the truth or not, for the blood of Jesus covers all sins no matter how they act.
God's kingdom is love so we have to choose to follow the truth, and those that do not choose cannot be with God.
Mal 3:13 Your words have been stout against me, saith the LORD. Yet ye say, What have we spoken so much against thee?
Mal 3:14 Ye have said, It is vain to serve God: and what profit is it that we have kept his ordinance, and that we have walked mournfully before the LORD of hosts?
Mal 3:15 And now we call the proud happy; yea, they that work wickedness are set up; yea, they that tempt God are even delivered.
Mal 3:16 Then they that feared the LORD spake often one to another: and the LORD hearkened, and heard it, and a book of remembrance was written before him for them that feared the LORD, and that thought upon his name.
Mal 3:17 And they shall be mine, saith the LORD of hosts, in that day when I make up my jewels; and I will spare them, as a man spareth his own son that serveth him.
Mal 3:18 Then shall ye return, and discern between the righteous and the wicked, between him that serveth God and him that serveth him not.
Mal 4:1 For, behold, the day cometh, that shall burn as an oven; and all the proud, yea, and all that do wickedly, shall be stubble: and the day that cometh shall burn them up, saith the LORD of hosts, that it shall leave them neither root nor branch.
Mal 4:2 But unto you that fear my name shall the Sun of righteousness arise with healing in his wings; and ye shall go forth, and grow up as calves of the stall.
Mal 4:3 And ye shall tread down the wicked; for they shall be ashes under the soles of your feet in the day that I shall do this, saith the LORD of hosts.