If the law is your baseline standard for what is moral, then you should probably try a little harder and put some thought into whether or not cryptocurrencies deserve to actually be illegal. For the most part, it is not illegal to own or trade in cryptocurrencies in the developed world.
The US dollar has far more infrastructure and institutional support preventing it's collapse than bitcoin.
We've seen this attitude before. Too big to fail, FDIC insured, Fannie Mae/Freddie Mac, auto industry bailouts, airline industry bailouts, investment bank bailouts. Debt increases perpetually. Money creation increase perpetually. Mortgage rates going to 0. Treasury yields going negative.
All this is completely normal.