Some will come when called. Some will come when trouble hits and they need a savior. Some will come when the Lord presses them with hunters and fishermen to hook them. Some will not come and they will PERISH. Not that it is God's plan...they choose to perish. See John 3:16
The day is coming when every knee will bow, every tongue confess that Jesus Christ is Lord. There will be no other option or opinion. Consider the heart of the Father towards his lost and hiding ones. Even toward the complacent.
If you question the hand of God in using trouble...you don't understand prophecy:
Jeremiah 16:16 "But now I will send for many fishermen," declares the LORD, "and they will catch them. After that I will send for many hunters, and they will hunt them down on every mountain and hill and from the crevices of the rocks.
Zephaniah 1:12 At that time I will search Jerusalem with lamps and punish those who are complacent, who are like wine left on its dregs, who think, 'The LORD will do nothing, either good or bad.'
Amos 4:2 The Sovereign LORD has sworn by his holiness: "The time will surely come when you will be taken away with hooks, the last of you with fishhooks.
Jeremiah 6:9 This is what the LORD Almighty says: "Let them glean the remnant of Israel as thoroughly as a vine; pass your hand over the branches again, like one gathering grapes."
Jeremiah 4:29 At the sound of horsemen and archers every town takes to flight. Some go into the thickets; some climb up among the rocks. All the towns are deserted; no one lives in them.
Isaiah 2:21 They will flee to caverns in the rocks and to the overhanging crags from dread of the LORD and the splendor of his majesty, when he rises to shake the earth.