Are bitcoins really safe? I think it's not safe, since you do not have any proof of your ownership of the bitcoin. When you lose you can not go tell the authorities to report that you lost some bitcoin. However, I still invest in this market because the profitability of this market is too great.
Forget about the authorities. A friend of mine got stolen for the 15th time - no joke ! - and since in the 14 previous times police did nothing, he did not even bothered to report it, since all they do with it is statistics, even probably biased. This is to say that in life, if you lose something, Bitcoin or not, you can only count on yourself. But Bitcoin is safe enough so it should never happen if you are cautious enough.