Sorry for the delay. You were not downvoted by Eugine_Nier / Azathoth123 (nor by any other single individual), and the pattern of downvotes to you was not similar to how other people were mass-downvoted. Downvotes of you were much more evenly distributed among voters.
This per se does not exclude the possibility of motivated downvoting, but that would have to be someone else, using a different modus operandi. (I tried to develop a finer technique to detect "artificial" voting patterns, but I didn't finish it.)
Sorry for the delay. You were not downvoted by Eugine_Nier / Azathoth123 (nor by any other single individual), and the pattern of downvotes to you was not similar to how other people were mass-downvoted. Downvotes of you were much more evenly distributed among voters.
Are you sure? I recall losing lots of karma points in one period over a few hours, right after an unpleasant confrontation with a couple other posters.
ETA:
Who downvoted these three posts, my hypothesis is that it is the same person or persons.
Some time back, I wrote that I was unwilling to continue with investigations into mass downvoting, and asked people for suggestions on how to deal with them from now on. The top-voted proposal in that thread suggested making Viliam_Bur into a moderator, and Viliam gracefully accepted the nomination. So I have given him moderator privileges and also put him in contact with jackk, who provided me with the information necessary to deal with the previous cases. Future requests about mass downvote investigations should be directed to Viliam.
Thanks a lot for agreeing to take up this responsibility, Viliam! It's not an easy one, but I'm very grateful that you're willing to do it. Please post a comment here so that we can reward you with some extra upvotes. :)