Wait, you are not going to Japan because of one TripAdvisor user post?
That's like me deciding not to go to the USA because someone posting something like this:
Now read this and think again about that one post that made you not go to Japan.
That's like me deciding not to go to the USA because someone posting something like this:
The last I heard, Americans are still living their lives. Being shot when visiting New York or nearby areas isn't an issue.
You are responsible for your family's well-being though. There are folks who feel USA as a whole is too risky so they don't go. The government, on the other hand, assures you that it's a safe place to go. It's up to you to assess the risk and choose what you believe.
Now read this and think again about that one post that made you not go to Japan.