I think regulations are necessary.
The anonymity of crypto currencies can be and is abused.
There is money laundering, tax evasion and scamming people for their money when they invest in fishy ICOs.
All of that I consider to be anti social.
If a government finds a way to prevent this and if that way does not end up in too much surveillance, I would support it.
True, this does happen. But what about fiat? I'd be interested to know the figures fiat vs crypto in the amount of fraud. I'll have a look later when I have a moment. I do agree that something to combat fraud, and tax evasion, needs to be implemented else it will just run riot, and that's not a good thing.