it's costly for the society (more regulations, more resources to deter, individual or business accepting it accidentally >direct loss,...) Counterfeit money exists since the Ancient Rome at least, and it can destroy a government and its economy. Even the Nazis were counterfeiting the USD and GBP (
Operation Bernhard) If only 1% of your circulating currency is fake your government is out. It can't borrow money anymore, business will stop to accept the currency, and since it's the only one, then the economy will be dead.
Do you know how many Bitcoin has ever been counterfeited since10 years?
ZERO !yes, cryptocurrency is more secure. fast transaction and almost no error(except human error). most of all is the decentralized thing that conquers the banking system. but i want to state that nowadays banks start to implementing some decentralized features to their conventional banking system. and the fact that their own system is well established and supported. some way this will the biggest threat for crypto world. hope wecan find some solution