I don't know about trustworthiness in particular, but lots and lots of personality traits turn out to have a heritability of about 50% (or more), so much so tha

I don't know about trustworthiness in particular, but lots and lots of personality traits turn out to have a heritability of about 50% (or more), so much so that it's a decent rule of thumb to guess that a trait is about 50% heritable.