No, we haven't. There is zero excuse for doing 50 in a 30, end of.
9PM. Pitch black. School disco near by, so very real likelihood of lots of kids around. Conditions not great. That kind of driving falls well short of what would be expected by a competent driver. I'm not having a go at the OP for being honest (in fact he should be applauded, too many people try to make excuses) and yeah, the kid aspect is quite humorous, but I personally cannot look at that set of circumstances and just laugh it off.
If people want to do 100mph on the motorways or similar speeds on well sighted roads, then that's their prerogative. Not something I'd do, but I don't see a massive amount of harm in it at all. However, 50 in a 30 is almost never acceptable, and certainly not in a built up area on a winter night when there's kids around.