It would be an unmitigated disaster.
There are no flawless humans in this world; the so-called pure have never existed. Even if there were, I'm afraid they could hardly be called human. Everyone has a dark side they would prefer to hide from others. To live among a group, one must don a mask to conceal their true self—it's an unavoidable circumstance.
Indeed, humans are foolish creatures who cannot survive without their masks.
Given the opportunity to rip off their masks, when every person must confront the horrors lurking in their own hearts and those of others—when all trust, ethics, and legal order vanish—that must be a hell that brings unparalleled joy. This kind of hell is far more effective in revealing the essence of "humanity" and "life" than experiencing life through things like dissecting bodies or touching organs.