From all the puzzles that i collected, i think that someone has something personal to Rofo, maybe after reading the PDF's and Rofo's strong points there.
So that person(s) wants to prove that Rofo's coin fails (and in that way prove that his opinions are also wrong).

Which, as we all know, is very childish.

So, as they form maybe a group with LOT of btc (look at extraction. also consider that only the last attack should have costed easily more than 12-15 btc, depends if the rigs were rented), now they can do all kinds of dirty tricks (dbl spending, fud on this thread, ddosing the pools (?), renting high hashrates from time to time for another fork etc.) just to prove some point and without any obvoius reason.

At least to me.

And the funny part is, that you cannot even prove who is "they", because they never stand clearly in the front row, telling: "My name is... AND I want from your coin this and that." No. Always messing things up from the background, speading fud and dezinformation, playing those little kid's games. ...
Something like 4chan but worse.