one could put trust in miners
what exactly do you mean by "put trust in miners" here?
Bitcoin could be doomed if a country decides that Bitcoin is a threat to national security and is willing to spend whatever it takes to dominate the hash rate and destroy Bitcoin via double-spends and DOS.
it may be possible to cause some short term drama and maybe some small damage to bitcoin but it is extremely hard for a 51% attack to destroy bitcoin.
such attacks must be accompanied by scamming of a large number of bitcoin users out of a very large sum of money to be able to damage bitcoin. the scenario you describe requires that country to start trading with other bitcoin users and then scams them by reversing the transaction! the cost of such scam is too huge which includes legal problems for that government.
otherwise just finding the same blocks that were mined and ending up with a longer chain could not "destroy" bitcoin.