Kids are merciless. Once the heel strap snaps they just let the fin sink, and since one is no good theyll jilt another one too.
It cost them nothing, and the new pair will cost them the same: parents are like that.
Instead of cutting out the new strap out of an old inner bike tube, theyll simply buy a new pair of fins for their spoiled brat.
In a way, our children only reflect us and our throw-away-and-forget mindset.
Makes me hesitate to forecast anything about future generations...