we don't need to regulate cryptocurrencies but regulations can be also helpful with the adoption and growth of them or they can be restrictive and even prevent the adoption altogether. in the end it will come down to what they are regulating and how. for example if it is regulation of exchanges and if it leads to a more secure place where people can trade with less risk that would be a very good thing.
If we are talking about the possibilities or the cons, the digital money has, it is indeed meeded to be regulated in order to ensure the security of every users. In able for us to have more security in every transaction we are up to. And also in that way the scammers may be track down and banned using crypto.