1) While Bitcoins are not controlled by an actual Government, etc, that also means that there is no official "customer service" for Bitcoin, especially when it comes to reimbursement; If you lose your private keys you are screwed, the coins are gone and therefore your money. Doesn't matter who you buy Bitcoins from, they can't help you at that point. Some companies have made this pretty avoidable though, by just allowing a username and password to sign into your Bitcoin wallet.

3) Bitcoin can be stolen through malware, social engineering, being robbed at gunpoint, etc. Malware can certainly be avoided, you can store your Bitcoins offline, encrypted, etc. on a malware free machine/device. Social engineering is unlikely, if you are familiar with Bitcoins, you are probably familiar with social engineering. Being robbed at gunpoint can hopefully be prevented by meeting in a busy coffee shop, etc.