"If the first time you traveled was because you accidentally encountered a time-space wormhole, what about the second time? How should you explain it? I think if there is a god who controls everything in the world, or an advanced alien civilization that exceeds our human civilization in multiple dimensions, it shouldn't make you keep traveling through time just for a subway bombing."
"And how did the other you disappear? Could it be that "God" lets you travel back to the day on the 24th every time, and then erases you on the 24th? If there is such a magical power, wouldn't it be more convenient for it to directly kill the murderer of the explosion?"
"The deaths of hundreds and thousands of people are insignificant to the entire earth and even the entire universe. I believe that if there is a god, it is impossible for it to waste energy to open a so-called space-time wormhole to allow you to continuously travel through and do such a trivial thing."
"So, is what you call time travel really time travel, or is it just your own imagination?"
Concept: an endless cycle of time dilemmas