Hey, I’m with you. I believe God will give us many, many chances to repent before we’re allowed to leave this life.
Tiller used up his last chance, and was taken out of the picture before he killed any more innocents. God used a flawed, wicked, troubled person to do so.
Our Christian forefathers in the Roman Empire faced incredible evil and did not strike back in violence. The same is true of the incredibly brave Christians who labor in Communist and Muslim countries today. Vengeance is the Lord's, not ours.