It is in a sense weeding out.
Jesus told the parable of the wheat and tares growing together, and then the angels weeding out the tares and casting them into the fire.
Who were the wheat? The ones God had mercy on, and the tares were those left to perish, as God is by no law obligated to save those justly under condemnation because of their own doings. As I said before, no judge is obligated to free a criminal who is justly under the punishment of his crime, but he can have mercy on whom he wills. So it is with God.
And you're right, no one is better than anyone else, that's why it's *grace*. We were/are all rightly under condemnation and God is not obligated by any law to save those justly under the penalty of their own sin, but He can have unmerited mercy on those He wills, to the glory of His mercy.