The USD is not “backed by” the US government. It is not backed by anything at all.
The US Dollar has been losing value for my entire life – I’m old and crusty. This is not “stable”. Lately, the US Dollar has been losing value relatively rapidly. Again, not “stable” at all.
Bitcoin’s price is volatile compared to the USD, but it tends to more than double in value each year, long term average.
If they want a smooth ride to zero, hold USD.
If they want a long, bumpy ride to riches, hold Bitcoin.
Main thing: you can tell they lack understanding by claiming that the USD is “backed by” the government.