I have another problem if someone wants of speculate.
I have come to conclusion that time travelling could be in direct conflict with christianity.
You go 200 years back and help another person to have a happy life instead of commiting many crimes.
But the problem is that the soul of that person is already in hell.
So when that person dies what will happen. Will the soul be moved in heaven or duplicate will be made so that it can be on both places what makes sense because that soul lived good and bad life.
I can complicate even further but this is enough for now.