Well, just the other day, someone posted a article that reveals Malware that were for sale to target Bitcoin ATMs. So, these guys are not just targeting Fiat ATMs. If government sanctioned attacks are launched at Bitcoin ATMs and people's private keys are hijacked or coins re-directed, then this will have a huge impact on people's ownership of coins.

They may lie dormant, until they gathered enough information and then shift massive amounts of coins from "active" wallets in one sweep.