[Ginko merely speaks to him the way he would any stranger he met in the road, even if that's markedly different that how a normal person would go about it.]

So-- you don't find healing useful because you never know if your healing an enemy? What if you were the only one on hand when someone was returned from a kidnapping-- and you could save a life? What if it was a child?

I can't think of a reason that healing wouldn't be worth learning.