Environment vs genetics is a minefield for anyone who tries to be objective. Just say that differences are in 99% shaped by environment and you are fine and safe for today. However a lie is good for a short time, but really bad for a long term. Especially if it becomes a base for, let's say, a national policy.

Also, saying it is mostly environment makes individuals blame others for their own failures - "I am perfect, the environment is wrong and has to change".

A sad thing is that scientists that study this question get publicly destroyed.