[witch hunt def.] "the act of unfairly looking for and punishing people who are accused of having opinions that are believed to be dangerous or evil" - Merriam-Webster

That is exactly what you attempting to do.

This is a proper investigation into accounts that are defrauding Steemit

No one is 'defrauding' steemit. They are using the blockchain as the rules allow. If there were some sort of "exploit" that allowed people to vote multiple times with the same SP, earn rewards in excess of that determined by the programmed formulas, etc., that would be something reasonably described as "defrauding" Steemit. Otherwise, it is 'defrauding' only because you and your accomplices don't like the posts, don't like the rewards they earn, don't like the authors remaining anonymous, believe that you have the right to impose your will over that of the SP holders, and have taken it upon yourselves to declare this as 'defrauding'. There is no other basis for it.

I don't know how else to say it: If you like the posts, vote for them. If you don't like the posts, don't vote for them, or if you feel strongly enough they are bad for the system, then downvote them. The blockchain then impartially determines the outcome. That's what the system does, and as long as no one has discovered an "exploit" such as I described above, your complaints are just disagreement about subjective value being taken to an endless platform of trolling and counter-trolling instead of left to the blockchain to objectively count votes and decide on rewards. I prefer the latter.