Well passing under a green light, i think it is okay to assume people are not walking across under red light.
Me on the other hand i almost did the same a few days ago, but at a lone crosswalk where i should be extra vigilant and stop for pedestrians, but i just did not see the guy in his all black outfit, so lucky the timing was on my side and he only gotten 1 step into the crossing and from the far side.
Even if you have the right of passage, it do not absolve you from being careful about your own well being, i always look left and right, even if i have a green light its a habit i picked up in my younger days with very loud car stereos.