the most valuable cryptocurrency with the most usage and biggest number of users is bitcoin. hackers have been trying to find exploits in bitcoin to hack it for 8.5 years and they have been failing.
the only thing they could do so far is hacking exchanges, stealing wallets with no password, and tricking idiots into giving them their private key directly
edit:
here is a bitcoin MultiSig containing 119,635BTC = $282 Million
feel free to start hacking it
https://blockchain.info/address/3D2oetdNuZUqQHPJmcMDDHYoqkyNVsFk9r
ethereum is supposed to be a smart contract platform and already has the biggest shame of all times: the DAO
and the news keeps coming.
who is to say there aren't more exploits waiting to happen on this coin. there sure are a lot of them happening these days as price is still somewhat high.
you know hackers never kill something right away, they do it slowly to gain the value. like this hack which was only a small amount not all ($32 mil) while the main hacker could empty everything at once.
Seems I was right from the very begining, I didn't like this coin and for me main reasons were hardforks. Suddenly as we see it has bugs and is not safe, seems it's very hard for altcoins to be concurent of bitcoin, many fails.....
As you mentioned, bitcoin is safe (can't say it don't has bugs but currenrly no one has done anything).
I think there will be another etc hard forks again, hope finally something will be fixed at least
What happened is something unethical that people tend to rejoice over their heist, I mean the hackers whereas some other people are in pain because of their lost investments. There is no coin that cannot be hacked but btc has equally proven over the years to be a formidable force against hackers which is something we continue to hope and this impending hardfork does not create a vacuum to be exploited for such purpose.