If I'm not mistaken, there was no direct hacking involved in that particular incident rather some crafty people were able to connect certain data to passport numbers of registered voters because of the flaws in the design of the system itself.
And this is the problem, the blockchain technology is here to make our lives easy, but if people who don't understand it at all try to use it, then it will have tons of vulnerabilities... they should hire experts to develop the voting system, and not leave it the normal programmers.
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I assume it was developed hastily and maybe they haven't done or disregarded any extensive testing. I hope this incident will serve a lesson to all who wish to utilized the benefits of blockchain technology that they make it more robust and secure as possible in order to avoid any future issues.
I even think this project should be done by vitalik buterin, that would be the right way.
It would be nice if they have hired people with extensive experience in that field in the likes of VB but even so, it would still take significant amount time to develop such project to become efficient and effective as possible. Imho.