What was Crimson's reaction to this dialog from flowey in-game?
they've heard it so many times.
no. they really don't have anything better to do.
even if they did the attachment they have to this world is too strong to allow the to let go.
the first time they heard it they froze for a moment pondering over what else they could be doing...
well, even if it's a waste of time, isn't that the whole point?
they chuckled. they aren't sure why themself. they just know that there's no other thing they'd rather be doing than messing around the timeline.
seems like even flowey didn't completely understand. or maybe he did and he was projecting his own former actions to them.
they don't have anything better to do.
because change is scary and a painful repeative wound feels safer than new unexpected stitches.
they don't want to leave their comfort bubble. even if it's poison.