Hmm I see what the dictionaries are saying but (using an example from above) I think argument exists that:
If me and my fellow protestors block a road, we are being non-violent, but we are not being peaceful.
But it's Friday and no time for argument!
I see a lot of other people have responded with examples and argument.
So I'll disagree and say the argument falls apart when I don't argue. (Cause it's Friday. You ain't got no job. You ain't got shit to do. I'm gonna get you high today.)