It is not about safety.
It is about power.
hint:
Last seen in Germany before the exterminations.
So, legally, the TSA could seize jewelry, laptops, cell phones, wedding bands, gold fillings in your teeth, pacemakers, any cash....
After all, the TSA was enforcing prohibited items. Amtrak forbids "Fragile and/*OR* valuable items". Everything I mentioned is fragile or valuable.
A long time ago, we became the Soviet States of America, but nobody announced the name change.