The city I lived in in China was the site of the Japanese invasion and one of the locations where experiments like this were carried out. You can visit the museum commemorating the invasion and see what the soldiers did to the people (which seem to have been more bizarre forms of torture rather than scientific research of any description). There are a number of Japanese people living peacefully in the city, but there's a strong undercurrent of anger and bitterness against Japan that even spreads to young children. Some of it is fueled by the political powers, but you can see how deep the scars from this kind of event can go.
I admire the concept that forgiveness is something you must do for yourself, as in the end the bitterness is just harming you. Sending a strong message that while you are not brushing the event under the carpet or denying the responsibility of those who did the action, you will not pursue justice for the sake of your own peace and that of the wider community is very powerful. It's not unproblematic on a larger scale, but when it is a free decision you make for yourself, it seems like one of the only ways to really move on from something like this.