When a turbine wheel/disk fails, it’s supposed to be contained within the engine. Often it is not.
When the disk pieces fly outside the engine casing, it’s a 100 pieces of hot shrapnel going everywhere, especially, as in this case, into fuel tanks.
There is a REASON they have that funny red stripe painted on the outside of the engine area on many military planes...:) I suspect you don't see it as much any more because you don't have as many turbine failures as there used to be back in the day...