I am a chinese answer are below:
1 bitcoin should die because this challenge their right to create money
2 large proportion of people do not have knowledge about bitcoin. gov should protect them from suffering scams
3 pumps and dumps makes people lost their money quickly
4 bank and financial institutes a fear of bitcoin can substitue them
Besides, steeling private keys, exploring wallet vulnerability, operating fraudulent exchanges and investing funds, dark web market place are other negative impacts of the coin on individuals and markets. But despite banning Bitcoins, China could also use alternate strategies for reducing security risk. Using highly secure wallets, avoiding the dark web and researching Bitcoin exchanges and other services could make Bitcoin safe to use for multipurpose and the masses could be benefited from the numerous fruits that Bitcoin ears.