Maybe your analyzing the movie "too too" much.
Perhaps you're correct, I'm not sure if the glove being white has any relevance to anything, as even if it does portray 'good/peaceful' what significance does this have to the scene?
Although, now i think about it, it could suggest that as Edie wears the glove, she is good and peaceful. As she drops it, it becomes some what dirty, at which point Terry brushes the dirt off, showing his own inner goodness and peacefulness, a facet (

) to his violent attitude.
I think it's always best to question the choices the director made. Why wasn't that glove black? There is no such thing as over analysis in my opinion.. You may however, incorrectly interpret something i guess.
but as i typed this reply, i began to see myself agreeing with azure.
does anyone have anything else to add to the glove scene?