As for specifics of why, that's something I've chosen to do and that's all that matters.
No obligation to share, certainly.
Curiosity is there in part because we may learn a valuable lesson - something those “with nothing to hide” [I know] might not’ve considered. (not a request, we can learn from others)
I don’t bother with this level of defensiveness but I can follow the reasoning.
Not really sure how any of that has anything to do with leaving a browser history
“[Any/most documentation of activity and behavior] is nothing but self incriminating evidence.”
I don't care if I think I've done nothing wrong. The jackbooted thugs at the border might have a different say so, and now you're screwed because you felt like your history was necessary. I trust no one, and I'm not even a freedom fighter.