Sadly, 99% of Japanese have never heard of unit 731, and the fe what HAVE heard of it, the government here still denies it ever happened :/
About 10, or so, years ago, there was a doctor that was involved in 731 that came on camera (crying from guild) and asked for forgiveness for what had happened. Immediately after that, the government here said he was crazy and they have no idea what he was talking about. :/
apologies from typos :p