almost imposible in my opinion to hack Bitcoin wallet, it not mean can't be hacked. Maybe a professional hacker could hacking it, yet i never heard a news about bitcoin wallets are hacked. All hacking crime almost happened on the exchange. why the hacker should to hack bitcoin wallet if they can hacking more easier on the exchange? If Bitcoin wallet is hacked of course the credibility of Bitcoin will decreased and losing trust from the society, I think the hacker wouldn't to do that because they also love this technology.