The Government can already track crypto users with the aid of exchanges since they are centralized, and can answer to the request of the government to disclose the identity of a customer should any need arise for that, tbh, I don't think there should be any concern on the use of cryptocurrencies, Bitcoin is now being adopted by renowned institutional Investors/companies, prominent individuals and the rest, that's quite an indicator that Bitcoin is not a coin for money laundering or the likes of that, but a currency, investment, a hedge against gist inflation/devaluation, and prolly the government are only concerned cause it gives it's users control, freedom from manipulation, makes them their own bank etc, something that'll never be possible with fiat.

Of course they are, the thing about P2p is that it's risky for newcomers, they will prolly find it easier/safer buying Bitcoin from exchange, than from an individual, as newcomers they would prolly not be abreast with security protocols, but other than than, P2p is great.