The real question is why aren't there lot's of threads about multiple incidents and the real answer is this isn't a common occurance.
There is a lot more .40 sized planes than 33%+ planes. It is not a common occurrence of them crashing into people either, so of course there will be a lot less occurrences of a giant plane accident.
But let just one of the large planes crash into a crowd of people and killing or wounding several and the impact will be much worse for us. This would be true even if it is one of those huge 90% scale planes that obviously cannot fly at a sanctioned AMA field or event.