A Niceness Gene?

Oxytocin and vasopressin are two hormones that are known to affect how "nice" someone is. It turns out that there are specific gene receptors that boost the effectiveness of those hormones, especially in a person who views the world as a threatening place.

In other words, someone with those genes is more likely to be generous and engaged in civic duty.

Any chance we can splice those genes into people we don't like?