Most cars from the 70s (which when the VK design/platform dates from) were pretty flimsy- Renaults in particular were pretty scary in a crash before they got serious about safety in the early noughties.
This wasnt a Holden bashing (although those early Opel based cars were particularly bad, but not the worst), just a comment about the massive step change in safety and manufacturing a couple of decades ago where even a basic cheap car like a lancer has crashworthiness you'd have to buy a high end mercedes to access in the 80s or even 90s.