If it's crypto, it's safe.
Yes, if You keep the decryption keys to Yourself...
Well duh, keep your info to yourself, and you won't get hax0rd.
Bitcoiners must be pretty stupid, since plenty of them lost money on Gox. You trade, on an exchange, bro? Tell me all about keeping the priv. key to yourself

No, I do not trade, just hodling. If You want to keep bigger amounts of BTC on an exchange, maybe bitgo.com is something to check. But also I would like to have a second (and in case of hacking neutral third) party needed to confirm transactions to be safer. But meanwhile, I am waiting for MultiBit HD with Trezor support.