[discostu]

I love when people only quote half of your first sentence and then make a reply that shows they couldn’t be bothered to read the whole thing. They tell you twice they’re lazy and chose not to comprehend.

[Harmless Teddy Bear]

That was the only part of your statement that was accurate.

The rest of it was assumptions.

Here is your statement in full.

Basically I thinks it boils down to the universe is HUGE and just doesn't care if 1 person somehow becomes “impossible”.

So you assume that the universe is sentient? Evidence?

Billions of people on the planets,

Really? What planets? So far there is only one planet which any form of life at all on it much less People that we know of. Anything else is assumption without evidence.

billions of planets in the galaxy,

once again assumption.

billions of galaxies in the universe.

And still once again assumption.

1 person goes back in time and kills their grandfather, so what.

So maybe everything.

Matter is rare, life is rarer and self aware life is the rarest stuff in the universe.

It's like a physically impossible grain of sand on the beach, who's gonna notice?

That made no sense at all.

But I think you were trying to express the idea that the solution to pollution is dilution which is accurate as far as it goes except in this case we are talking about self aware life which changes the environment around its self. So instead of a grain of sand which can only be acted on you have something that is continually in motion and changing. Remove one and you have a removed something who's effect is out of proportion to its size because it is part of the rarest element.