Is the risk higher or lower than the mess that currently goes on where large swaths of the political media coverage is around voting controversies and the like. There are always ways to manipulate but at least having it on a blockchain they are somewhat traceable.
Perhaps a one use key gets mailed to all voters prior to the election, or a text message, or bank signin numbers get used... Lots of various ways to limit gaming.
No such voting controversies in The Netherlands. Organising things well goes a long way (long opening hours for voting, vote wherever you like, many voting stations, paper record of every vote, and so on). Better to get that down pat first, then maybe try to automate. It's not as bad as all that everywhere.
Yes I know, Finalnd is relatively simple and well organised also but, it is still an expensive process that could be automated.