Oh I know why. It's because some members here are {stupid|juvenile|pathetic|vindictive}."Why?"
If it were not "reasonable, logical, intelligent behaviour" then clearly it was happening because the people concerned were being unreasonable, illogical and unintelligent. That's what being not reasonable, being not logical and being not intelligent means.(even if it it were not "reasonable, logical, intelligent behaviour", there has to be a reason why it only happened to you)
You cannot have it both ways. Either it was reasonable, logical, intelligent behaviour for people to vote down posts which had nothing wrong in them, to create multiple accounts so that they could cast more votes, to go back and vote down old posts, to vote down posts they hadn't even read just for their own amusement, etc, or it was not.
If it was, then I would repeat my request for you to explain why it was, and why doing those things was correct.
If it was not then you need to ask the people concerned why they behaved unreasonably, illogically and unintelligently, not I.
To the best of my knowledge, if you say it probably wasn't you could just as well say it possibly was.It probably wasn't
Pr[reasonable etc] + Pr[unreasonable etc] = 1.
I would be interested to learn why you think it might have been reasonable, logical and intelligent for people to vote down posts which had nothing wrong in them, to create multiple accounts so that they could cast more votes, to go back and vote down old posts, to vote down posts they hadn't even read just for their own amusement, etc.