Pitch hack

If someone buys your car for $2,000,000 and it turns out they stole the money (and used it as a getaway car), then yes you are partly responsible for the crime.

How so? With partly responsible you mean to say that me selling my Subaru for $2,000,000 makes me an accessory even though I had no knowledge that the money was stolen? Don't think so.
Also, using the car as getaway would have happened after the sale. What someone else does with property after it changes hands has no bearing on my culpability.

[Full Disclosure - I could not resist the temptation to own 100 chaos scrolls for that cheap and yes I did get permabanned. Bad choice on my part :-)]

Nexon can't and shouldn't have to differentiate between "legit" players who just happen to have 600 hacked scrolls, and "illegit" players who spawned their own chaos scrolls and Duey'd them to their other account. It's the same scrolls, neither person was forced to have them. I don't think a permanent-ban is the right solution in either case, maybe a temp-ban while they sort out who did what. By banning everyone with some number of chaos scrolls, they ensure that they can get rid of them properly (maybe track where they came from, since there's probably some marketer out there who's honestly not at fault here).

Nexon's decision to punish all in possesion was likely based on the fact that it was a lot easier/cheaper to do then to investigate and determine who hacked the scrolls and who was trying to take advantage of the artificially cheap prices. The sheer number of MTS transactions that would require analysis would cost a lot more than a simple

update player
set status = banned
where (select count from inventory where itemid=chaosscroll and player=playerign) > 0

or something to that effect. It's the same type of response as with the duped mesos. Carpet bomb first ask questions later if at all.