Setting aside the question of whether the truth should be suppressed because of consequences, this kind of research could very easily be beneficial.

Suppose you find out that the green people from East Arbitria are less productive. The immediate effect is that an innocent objective employer who being tried for discrimination or hated by a community no longer has to suffer- the cruelty of the universe is no longer being made anyone's fault. The secondary effect is that we now have grounds to investigate why Arbitrarians have that disadvantage. Maybe green people have a harder time metabolizing a nutrient; a non-issue with the diet/climate/lifestyle of Arbitria. An update to health recommendations later and millions of people's lives are improved.