I've been working as a software engineer at a big corp for four years, I've never even heard anybody shout, or anything that could be considered a rage outburst. Sometimes the volume goes up a little in meetings. I've heard of one or two people yelling through the grapevine, but I didn't personally observe it. In general, I don't think shouting has any place in a workplace. However, I also wouldn't fire somebody immediately for shouting once - a conversation with their manager and recommendation to take a few days off to unwind is a reasonable reaction to a single incident.
> Inappropriate emails
Can you be a bit more specific? My workplace sees a fair number of testy emails "X is totally fucking wrong" / "X totally shouldn't have been done without consulting me" but from experience, peoples perception of what an inappropriate email is varies widely.