It's pretty safe in Tokyo. Not every city requires you to be on the constant lookout for your own safety.
Perhaps you're used to cities with higher crime rates, and are projecting that onto every city.
Must we make up hypotheticals for my state of mind too? Perhaps stick to the facts and stay away from the person.
My point is this isn't a hypothetical; you can walk around Tokyo at night and be fine.
You really have no idea what you are talking about, but don't let it stop you.
> I wouldn't recommend [wandering around like a clueless tourist, late at night] in any part of any city.
I have lived in Tokyo, NYC, San Francisco for at least 2 years each. Tokyo is a concrete and non-hypothetical counterexample to your proposition.
> We can always construct hypothetical situations that meet some criteria.
How is not recommending going to dangerous neighborhoods in America a hypothetical situation? There is statistical data and crime maps. You cannot deny that.
I have also lived in places where not only would I advise more-vulnerable people against going out at night, I wouldn't go wander around myself either.
But yes the odds of being a victim aren't leaping from zero to 100 percent between these nighborhoods. More like aceptably low to unacceptably high.
We can always construct hypothetical situations that meet some criteria. I wouldn't recommend that in any part of any city.