KYC laws + public ledger = much much much better than gold for LEOs (edit: or cash, frankly).
Have you been paying attention to Dark Wallet, CoinJoin, various things like DarkCoin or even just the ability to trade BTC -> LTC -> BTC and vanish on the Blockchain?
Bitcoin might not be perfect, but it's more than enough to enable the step after very very easily.
Yes, but I think it's extremely unlikely that a) it will still be very easy when bitcoin has reached any level of significant traction, and b) even if it remains easy, most people will not do this which will give the authorities, among many other people, a fairly easy to follow trail. Doesn't mean it's impossible to commit crimes, but it makes it far shittier to just be a regular person.