That's right, this time it was just a few cents, but in the future it may be more, I am not against the @key-defender project is good even the @hive-defender is also good, but they have to eliminate the margin of error and abuse in them system as this happened.
And if for you the negative votes are a daily thing, for me it is not, I take care not to incur in any fault not to expose myself to this type of things.
No system is perfect. The fact that we can earn anything is pretty amazing, but we have to accept some risk with that. Even if you do nothing wrong someone may take against you. Better to accept that than get upset by it.
I hope they catch the person responsible, in my town we would lynch him and hang him from the nuts, have a nice day.
Next to that a little flag on your post does not seem so bad ;)