If politicians want to be in charge of a "docile" citizenry, changing the genes of newborn babies is not going to help with that, since by the time the newborns are grown up the politicians will be out of office.

I don't think your model of politicians is very good if you think that they only care about what happens when they are in office.

Maybe we can stop sneaking in connotations and debate things on their merits

Reducing testosterone would be a way to make people less aggressive. Even if it does reduce criminality, there a price to pay.