Re: Lucifer's Fall
I believe there have been multiple "altercations," though I don't believe any involved so high a percentage of the host than the first one. I also believe that is the only instance where the entirety of the Archangels were involved.
Now as far as Michael casting out the Morning Star, talks about it being rigged or whatnot, things in Heaven being extraordinarily bad. I've seen no evidence or text to support this really, and going alone on memories, I belief very differently. The thing that sticks out the most though is this, I don't believe Michael ever laid a hand on Morning Star to cast him out. The "Fall" is so named for multiple reasons, one could say it is a fall from grace, fall from service or even to fall out of formation, but the literal consequence is to be immediately expelled from the realm of Heaven. If the Angel that is Falling is not in Heaven, they don't move, but I believe that Angels who Fall have their permission to be within Heaven revoked instantaneously, and are forcibly launched. I also believe this is why there is talk of multiple levels of Heaven, that certain beings may only access certain portions of the realm of Heaven. The Silver City is, I believe, the core and only the most "Holy" may enter there.
As far as knowing or being asked to dissent, I don't think that was the plan, to me it doesn't seem to make sense. There is a purpose to that Fall, it was the first dissent, the first disagreement. It set the precedent for others to disagree, it needed the strongest of all to represent the other side, if it were not genuine, if it weren't actually the decision to go against orders, why would the Creator choose the brightest and most high Angel of the Host?
The maximum effective range of an excuse is zero meters.