Don't get me wrong.
Split rims can be dangerous but..... ONLY if you ignore these basic common sense safety procedures for them.
NEVER mix & match incompatible main rims, lock rings or outer flange rim rings.
Any rim component that has excessive rust or pitting should be thrown into the scrap pile.
Always have a healthy respect respect for any 3 piece split rim but, no more respect than you would give to a non split rim.
Failure to follow these simple guidelines can result in this consequence....