It's fair.
It's an attack on a reputation. If someone hacks my personal account and puts unfounded things in it, that is a matter of reputation, but we are talking about words.
If someone gets into the election data management system for an attack, we are no longer talking about reputation being at stake. That is real system hacking. Data, the program, the algorithm or the line of code is affected. A compromised line of code puts into question the election's legitimacy. Even if we manage to block the signal, our data that is at the foundation of our electoral system's management has just been compromised.
Is the compromised nature of data important enough for the election to be declared null?